Are you looking for some math words that start with the letter I? Look no further, you have come to the right place.

In this article, I’m going to embark on a journey into the realm of math words that start with the letter I. From algebraic equations to awe-inspiring angles, these words hold the key to unlocking the beauty and complexity of the numerical world.

So, without any further ado, let’s dive into the captivating world of “Math Words That Start With I” and discover the beauty and relevance of arithmetic in our lives.

**Math Words That Start With I**

The followings are the math words that begin with the letter I (In alphabetical order):

**1. i (Unit Imaginary Number):** The letter “i” represents the imaginary unit, a fundamental concept in complex numbers. Defined as the square root of -1, “i” plays a crucial role in various mathematical disciplines, including engineering, physics, and signal processing.

**2. Icosahedron:** An icosahedron is a polyhedron with 20 faces. Each face is an equilateral triangle, and there are 12 vertices and 30 edges. This geometric figure holds particular importance in crystallography and computer graphics.

**3. Identity:** In mathematics, an identity is an equation that remains true for all values of the variables involved. For example, the identity property of addition states that adding zero to any number leaves the number unchanged.

**4. Image:** The image of a function refers to the set of all possible values that the function can produce when its input comes from a specified domain. It is also known as the range of the function.

**5. Imaginary Number:** As an extension of real numbers, imaginary numbers are multiples of the imaginary unit “i.” These numbers can be expressed in the form “bi,” where “b” is a real number.

**6. Imperial System:** The imperial system is a system of measurement that uses inches, feet, pounds, and other units for various quantities. While it is less commonly used nowadays, it still holds significance in certain regions and applications.

**7. Improper Fraction:** An improper fraction is a fraction where the numerator is equal to or greater than the denominator. For example, 5/3 is an improper fraction.

**8. Incenter:** Incenter is a point of concurrency in a triangle. It is the center of the inscribed circle, also known as the incircle, which touches all three sides of the triangle.

**9. Inch:** The inch is a unit of length in the imperial system and is equivalent to 1/12 of a foot. It is still commonly used for measuring small lengths, especially in the United States.

**10. Incircle:** The incircle is the largest possible circle that can be inscribed within a polygon, such as a triangle or a regular polygon. It is tangent to all the sides of the polygon.

**11. Incircle of Triangle:** As mentioned earlier, the incircle of a triangle is the circle that touches all three sides of the triangle from the inside.

**12. Included Angle:** The included angle is the angle between two sides of a polygon or a shape. In a triangle, it refers to the angle formed between two sides of the triangle.

**13. Included Side:** The included side is the side of a polygon or a shape that lies between two given angles.

**14. Income:** In mathematical economics, income represents the money earned or received from various sources, such as salaries, investments, or businesses.

**15. Increase:** Increase refers to the act of becoming greater in quantity, value, or size. In mathematics, it often relates to positive changes in numerical values.

**16. Increment:** An increment is a small positive change in a variable or a quantity.

**17. Indefinite Integral:** In calculus, an indefinite integral is an antiderivative of a function. It helps find the original function when the derivative is known.

**18. Independent Event:** In probability theory, independent events are events that do not influence each other’s outcomes.

**19. Independent Variable:** In mathematical modeling and statistics, the independent variable is the variable that is manipulated or controlled in an experiment or study.

**20. Indeterminate:** Indeterminate refers to a mathematical expression that does not have a unique value or cannot be evaluated with the given information.

**21. Index:** In mathematics, the index refers to the power to which a number, variable, or expression is raised. It plays a vital role in exponents and logarithms.

**22. Induction:** Mathematical induction is a proof technique used to establish statements for all natural numbers.

**23. Inequality:** An inequality is a mathematical expression that states that two values are not equal. It uses symbols such as > (greater than), < (less than), ≥ (greater than or equal to), or ≤ (less than or equal to).

**24. Inequation:** An inequation is a mathematical statement that involves an inequality.

**25. Infinite:** Infinite refers to a quantity or magnitude that is boundlessly large or limitless.

**26. Infinite Series:** An infinite series is the sum of an infinite sequence of terms.

**27. Infinitesimal:** Infinitesimal refers to a quantity that is incredibly small, almost approaching zero.

**28. Infinity:** Infinity represents an unbounded quantity that has no limit or end.

**29. Inflation:** In economics, inflation is the rate at which the general level of prices for goods and services rises, eroding the purchasing power of currency.

**30. Inradius:** The inradius is the radius of the incircle of a polygon, especially a triangle.

**31. Inscribe:** Inscribe means to draw or place a figure inside another figure such that all points of the inner figure touch the boundary of the outer figure.

**32. Inscribed Angle:** An inscribed angle is an angle formed between two chords of a circle with the vertex on the circle.

**33. Insurance:** In mathematics, insurance involves risk management and the study of probabilities to determine premium rates and coverage.

**34. Integer:** An integer is a whole number that can be either positive, negative, or zero.

**35. Integral:** In calculus, the integral is a mathematical concept that represents the area under a curve.

**36. Integrand:** The integrand is the function that is being integrated in calculus.

**37. Intercepted Arc:** In trigonometry, the intercepted arc is the arc of a circle intercepted by the central angle formed by two rays originating from the center of the circle.

**38. Interest:** Interest is the amount paid for the use of borrowed money or the amount earned on an investment.

**39. Interest Rate:** The interest rate is the percentage at which interest is charged or earned on a principal amount over a specific period.

**40. Interior Angle:** An interior angle is an angle formed between two sides of a polygon or a shape inside the figure.

**41. Interpolation:** Interpolation is the process of estimating values between known data points.

**42. Interquartile Range:** The interquartile range is a measure of statistical dispersion, representing the difference between the first and third quartiles of a dataset.

**43. Intersect:** In geometry, two or more lines, rays, or line segments are said to intersect when they meet at a common point.

**44. Intersecting Lines:** Intersecting lines are lines that cross each other at a single point.

**45. Intersection:** The intersection is the set of common elements between two or more sets.

**46. Interval:** In mathematics, an interval is a continuous segment of a number line between two points.

**47. Invariant:** Invariant refers to a property that remains unchanged under a specific transformation or operation.

**48. Inverse:** The inverse of a mathematical operation undoes the effect of that operation.

**49. Inverse Function:** An inverse function undoes the action of the original function.

**50. Inverse Operation:** An inverse operation is an operation that undoes the effect of another operation.

**51. Inverse Property of Addition:** The inverse property of addition states that the sum of a number and its additive inverse (opposite) is zero.

**52. Inverse Property of Multiplication:** The inverse property of multiplication states that the product of a number and its multiplicative inverse (reciprocal) is one.

**53. Investing:** In mathematics and finance, investing involves allocating resources to assets or ventures to achieve potential returns.

**54. Irrational Number:** An irrational number is a real number that cannot be expressed as a fraction and has an infinite non-repeating decimal expansion.

**55. Irregular:** In mathematics, irregular refers to shapes or figures that do not have equal sides or equal angles.

**56. Irregular Polygon:** An irregular polygon is a polygon with sides of different lengths and angles that are not equal.

**57. Isometric:** In geometry, an isometric transformation preserves the size of an object without changing its shape.

**58. Isosceles Right Triangle:** An isosceles right triangle is a right triangle with two sides of equal length.

**59. Isosceles Trapezoid:** An isosceles trapezoid is a trapezoid with congruent base angles and legs of equal length.

**60. Isosceles Triangle:** An isosceles triangle is a triangle with two sides of equal length.

**61. Iteration:** In mathematics, iteration refers to the process of repeatedly applying a function to its own output.

I hope you found this article “Math Words That Start With I” helpful and informative.

Also, keep in mind that, this isn’t an exhaustive list, if there are any math words starting with the letter I.

Feel free to leave a comment below with the missing math word and I’ll update the list as soon as possible.

And, if you’d like to explore more math words starting with different letters of the alphabet, click the link below:

- Math Words That Start With J
- Math Words That Start With K
- Math Words That Start With L
- Math Words That Start With M