Question

Find the cosine of angle p

Answer 1

Answer: last option

Explanation:

You need to remember the identity:

`cos\alpha=(adjacent)/(hypotenuse)`

You need to find the cosine of angle P, then, you can identify in the figure that:

`adjacent=PR=21\\hypotenuse=PQ=29\\\alpha=P`

Therefore, the next step is substitute these values into
`cos\alpha=(adjacent)/(hypotenuse)`, then you get:

`cos(P)=(21)/(29)`

You can observe that this matches with the last option.