Question

Find the cosine of angle p

Answer 1

Answer: last option

Step-by-step explanation:

You need to remember the identity:

$cos\alpha=\frac{adjacent}{hypotenuse}$

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  $cos\alpha=\frac{adjacent}{hypotenuse}$, then you get:

 $cos(P)=\frac{21}{29}$

You can observe that this matches with the last option.