sine and cosine of complementary angles

sin 20⁰ = ?

• cos 70⁰
• sin 70⁰
• cos 20⁰
• tan 20⁰

Tags

CCSS.HSG.SRT.C.7

cos 40⁰ = ?

• sin 50⁰
• cos 50⁰
• tan 50⁰
• sin 40⁰

Tags

CCSS.HSG.SRT.C.7

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

• x + y = 90⁰
• x = y 
• x = 2y
• x + y = 180⁰

Tags

CCSS.HSG.SRT.C.7

If sin x = cos x, what is the value of x?

• 45⁰
• 90⁰
• 30⁰
• 60⁰

Tags

CCSS.HSG.SRT.C.7

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

Tags

CCSS.HSF.TF.C.8

cos 38⁰ = ?

• sin 62⁰
• sin 52⁰
• cos 52⁰
• sin 38⁰

Tags

CCSS.HSG.SRT.C.7

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.

Tags

CCSS.HSG.SRT.C.7

sin 1⁰ = ?

• cos 89⁰
• cos 1⁰
• sin 89⁰
• tan 1⁰

Tags

CCSS.HSG.SRT.C.7