Complementary Angles and Trig Functions

A pair of angles that add up to 90º

• Complementary

• Complimentary

• Supplementary

Hint: The sin of and angle = The cos of its complement

• A

• B

• C

• D

Sin(60°) = Cos( ?°)

• 10

• 20

• 30

• 40

If cos α = sin β, what must be true about α and β?

• α and β are complementary angles

• α and β are congruent angles

• α and β are right angles

• α and β are supplementary angles

Choose the correct ratio.

• sin(37)=x/14

• cos(37)=x/14

• tan(37)=x/14

• sin(37)=14/x

sin(B) = cos(C)

• true

• false

Select all that apply: What is true in respect to the relationship of the sine and cosine of complementary angles? A and B are the acute angles of the right triangle. 

If 𝜃 is the number of degrees of one acute angle in a right triangle, and sin(𝜃) = 3/5 , find cos (90 − 𝜃).

• 3/5

• 5/3

• 3/4

• 4/5

Select all that apply: What is true in respect to the relationship of the sine and cosine of complementary angles? A and B are the acute angles of the right triangle.