Question

What is the length of PR?

Answer 1

5/x=15/21=

15x=105

x=7

Answer 2

Hi!

So we need to know how much smaller ΔPQR is than ΔDEF.

See line DE compared to PQ. PQ is 3 times smaller than DE. That means ΔPQR is 3 times smaller than ΔDEF.

So to find the length of PR, divide DF by 3.

21/3 = 7

x=7

Hope this helps! :)

-Peredhel