34-c Sine and Cosine: Complementary Angles

Front

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

Back

α and β are complementary angles.

Front

What is the cosine of angle A?

Back

b/c

Front

What is the missing number? Sin(70) = Cos ( )

Back

20

Front

What sides do you use for the SINE ratio?

Back

Opposite and Hypotenuse.

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What is the relationship between sine and cosine for complementary angles?

Back

sin(θ) = cos(90° - θ).

Front

What is the sine of a 30° angle?

Back

1/2.

Front

What is the cosine of a 60° angle?

Back

1/2.

Front

If two angles are complementary, what is the sum of their measures?

Back

90°.

Front

What is the sine ratio in a right triangle?

Back

Opposite side / Hypotenuse.