Quiz- Trig Ratio Complementary Angles, Special Right Triangles

sin(20) =

• sin(70)

• cos(70)

• tan(70)

• cos(20)

cos(43) =

• sin(43)

• sin(47)

• 1/sin(43)

• cos(47)

If sin x = 0.4352, then cos (90 - x) = ________.

• 0.5648

• 0.4352

• 2.2978

• 0.8106

If cos (90 - x) = 0.866, then sin (x) = _______.

• 0.5

• 0.134

• .866

• 0.0012

sin (A) = (BC)/(AC)

What other trig ratio equals (BC)/(AC) in this triangle?

• cos (C)

• sin (C)

• cos (A)

• tan (C)

If sin x = cos y, what must be true about x and y?

• x + y = 90⁰

• x = y 

• x = 2y

• x + y = 180⁰

If α and β are complementary angles, why is sin α = cos β?

• There is no reason, that is just the way it is.

• The adjacent leg to β is the opposite leg to α.

• Because α = β.

• Because α and β are greek letters.

What is the missing angle?
cos 12^o = sin _^o

• 168^o 

• 78^o

• 88^o

• 178^o

What is the value of x?
cos (2x - 17) = sin (x - 4)

• 17

• 27

• 37

• 47

If cosA = sinB then the two angles A and B have to be:

• supplementary

• complementary

• adjacent

• a linear pair