# Geometry-Trig

## 14 terms · Chapter 13 vocabulary

### perfect squares

numbers whos square roots are whole numbers 4,9,16,25,...

### square root

a number that when multiplied by itself equals a given number

a symbol to indicate the square root

An expression that contains a radical, such as a square root, cube root, or other root

The number or expression inside a radical symbol

### 45-45-90 triangles

the length of the hypotenuse is square root 2 times the length of one leg.

### 30-60-90 triangles

the measure of the hypotenuse is twice the measure of he shorter leg. the measure of the longer leg is (√3) times the measure of the shorter leg.

### Trigonometry

the mathematics of triangles and trigonometric functions

### Trigonometric Ratio

a ratio of two sides of a right triangle

### Tangent

ratio of the opposite to the adjacent side of a right-angled triangle

### Angle of elevation

the angle formed by a horizontal line and the line of sight to an object above the horizontal line

### Angle of depression

the angle formed by a horizontal line and the line of sight to an object below the horizontal line

### Sine

ratio of the opposite side to the hypotenuse of a right-angled triangle

### Cosine

ratio of the adjacent side to the hypotenuse of a right-angled triangle