What is the length of PR?
15
25°
P 5
E
1140
Q
25°
1140
X
21
R
F

Answer:
7
Step-by-step explanation:
Since the triangles are similar, we can use ratios
15 21
----- = ---------
5 PR
Using cross products
15 PR = 21*5
Divide each side by 15
PR = 21*5/15
PR = 7