Question

The sine of a 30 degree angle is equal to the cosine of a _____ degree angle. a.30

b.45
c.15
d.60

Answer 1

The sin of a 30deg angle = 1/2 and the cos of 60deg is = to 1/2. So the answer is D. Hope this helps!

Answer 2

D. 60°

Explanation:

We are required,

To find the degree angle when
`\sin 30=\cos x`.

Since, we know the relation
`\sin \theta=\cos (90-\theta)`.

We have,

`\sin \theta=\cos (90-\theta)\\\\\sin 30=\cos (90-30)\\\\\sin 30=\cos 60`

That is, x = 60°

Thus, the degree angle is 60° and option D is correct.