Right Angle Trigonometry Basics

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Tags

CCSS.4.G.A.1

Front

What do we call the longest side of a right triangle?

Back

The longest side opposite the right angle is called the hypotenuse.

Front

What is the ratio for tangent (tan) in a right triangle?

Back

The tangent of an angle is the ratio of the length of the opposite side to the length of the adjacent side.

Tags

CCSS.HSG.SRT.C.6

Front

In a right triangle, which side is opposite the right angle?

Back

The side opposite the right angle is called the hypotenuse.

Front

What is the formula for finding the hypotenuse in a right triangle?

Back

Tags

CCSS.8.G.B.7

Front

What is the sine (sin) of an angle in a right triangle?

Back

The sine of an angle is the ratio of the length of the opposite side to the length of the hypotenuse.

Tags

CCSS.HSG.SRT.C.6

Front

What is the cosine (cos) of an angle in a right triangle?

Back

The cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.

Tags

CCSS.HSG.SRT.C.6

Front

What is the relationship between the sides of a right triangle?

Back

In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides (Pythagorean theorem).

Tags

CCSS.8.G.B.8

Front

If one angle in a right triangle is 30 degrees, what is the sine of that angle?

Back

Tags

CCSS.HSG.SRT.C.6

Front

If one angle in a right triangle is 45 degrees, what is the cosine of that angle?

Back

Tags

CCSS.HSG.SRT.C.6