Right Triangle Trigonometry Precalculus

What is Sin C? Write your answer as a fraction.

Mathematical Equivalence

ON

Find a.

• 3

• 6

Solve for IR

• 28

• 7

This is a 45, 45, 90 degree triangle. Which two sides would be marked with an L?

• AB

• BC

• CA

Answer explanation

L can be replaced with any variable.

This is a 30, 60, 90 degree triangle. Which side would be marked with an L?

• AB

• BC

• CA

Answer explanation

L can be replaced with any variable.

This is a 30, 60, 90 degree triangle. Which side would be marked with a 2L?

• AB

• BC

• CA

Answer explanation

L can be replaced with any variable.

Match the special right triangle relationships of 30 degrees to their trigonometric function values of the special angles.

• sinθ

• cosθ

• tanθ

Answer explanation

This is something you will really need to memorize!

Match the special right triangle relationships of 60 degrees to their trigonometric function values of the special angles.

• sinθ

• cosθ

• tanθ

Answer explanation

This is something you will really need to memorize!

What Greek letter is often used to represent an acute angle of a right triangle?

• Delta

• Alpha

• Theta

• Beta

Answer explanation

Which trigonometric function is the adjacent over the hypotenuse?

• Tangent

• Sine

• Cosine

• Secant

Answer explanation

Cosine is written as cos(x).