In △PQR, sinP=2/5, sinR=1/2, and p=8. Find the side length r.

Question

r=8/5

r=4

r=20

r=9

r=10

r=32/5

Answer 1

Using the Law of Sines, sinP / p = sinR / r

So, (2/5) / 8 = (1/2) / r

(2/5)r = 4

r = 10

Answer 2

Use Law of Sines

8 / (2 / 5) = r / (1 / 2)