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3 years ago

Which is equal to sin 36°? A) sin 54° B) sin 64° C) cos 54° D) cos 64°

2 answers:

7 0

The sine of an angle is equal to the cosine of its complement, and the complement of 36° is 90° – 36° = 54°. Therefore, cos 54° is equal to sin 36°.

Rudiy273 years ago

5 0

Remember, sin(|x|)=cos(|90-x|)
so sin(|36|)=cos(|90-36|)=cos(|54|)=cos(54)

answer is C

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2 years ago

If E F = 7 , A C = 16 , and A F = 9

Vilka [71]

Answers:

CB = 14

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EF is parallel to CB

====================================

Explanations:

Points E and F are midpoints of their respective sides. They form the midsegment EF. Because EF is a midsegment, A midsegment is half the length of its parallel counterpart, so CB is two times longer than EF. If EF is 7 units long, then CB = 2*EF = 2*7 = 14

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