N I O I P I Q I R I S I T I U I V I W I X I Y I Z

**A**I B I C I D I E I F I G I H I I I J I K I L I MN I O I P I Q I R I S I T I U I V I W I X I Y I Z

## I

A number that when operating with it on any other number leaves the number unchanged.

The sum of any number and 0 is that number.

The product of 1 and any number is that number.

The result of a transformation on an object.

A fraction with a numerator that is greater than the denominator.

Including the ends. Example: List the odd numbers from 3 to 9, inclusive: 3,5,7,9

An addition.

Two events in which the outcome of the second is not affected by the outcome of the first.

A mathematical expression which shows that two quantities are not equal.

A limitless quantity.

An angle placed inside a circle with its vertex on the circle and whose sides contain chords of the circle.

A polygon placed inside a circle so that each vertex of the polygon touches the circle.

A whole number in the set of numbers containing zero, the natural numbers, and all of the negatives of the natural numbers.

The x-intercept of a line or curve is the point where it crosses the x-axis, and the y-intercept of a line or curve is the point where it crosses the y-axis.

The arc of a circle within an inscribed angle.

Angles within a polygon formed by the intersection of two sides.

With lines or curves, to cross or have a point in common.

Lines that have only one point in common.

With sets, the operation that creates a new set containing only those elements common to the original sets.

A set of values between two endpoints.

Opposite. −5 is the additive inverse of 5, because their sum is zero. 13 is the multiplicative inverse of 3, because their product is 1.

Two operations that have the opposite effect, such as addition and subtraction.

A number that cannot be expressed as the ratio of two integers.

A polygon with two sides equal in length.

A triangle with at least two equal sides.

**identity**A number that when operating with it on any other number leaves the number unchanged.

**identity property of addition**The sum of any number and 0 is that number.

**identity property of multiplication**The product of 1 and any number is that number.

**image**The result of a transformation on an object.

**improper fraction**A fraction with a numerator that is greater than the denominator.

**inclusive**Including the ends. Example: List the odd numbers from 3 to 9, inclusive: 3,5,7,9

**increase**An addition.

**independent events**Two events in which the outcome of the second is not affected by the outcome of the first.

**inequality**A mathematical expression which shows that two quantities are not equal.

**infinity**A limitless quantity.

**inscribed angle**An angle placed inside a circle with its vertex on the circle and whose sides contain chords of the circle.

**inscribed polygon**A polygon placed inside a circle so that each vertex of the polygon touches the circle.

**integer**A whole number in the set of numbers containing zero, the natural numbers, and all of the negatives of the natural numbers.

**intercept**The x-intercept of a line or curve is the point where it crosses the x-axis, and the y-intercept of a line or curve is the point where it crosses the y-axis.

**intercepted arc**The arc of a circle within an inscribed angle.

**interior angles of a polygon**Angles within a polygon formed by the intersection of two sides.

**intersect**With lines or curves, to cross or have a point in common.

**intersecting lines**Lines that have only one point in common.

**intersection**With sets, the operation that creates a new set containing only those elements common to the original sets.

**interval**A set of values between two endpoints.

**inverse**Opposite. −5 is the additive inverse of 5, because their sum is zero. 13 is the multiplicative inverse of 3, because their product is 1.

**inverse operations**Two operations that have the opposite effect, such as addition and subtraction.

**irrational number**A number that cannot be expressed as the ratio of two integers.

**isosceles**A polygon with two sides equal in length.

**isosceles triangle**A triangle with at least two equal sides.