Answer:
d. 8
Step-by-step explanation:
The perimeter of a triangle is the sum of the measures of the three sides.
For this triangle,
perimeter = PQ + QR + PR
We know PQ = 6, and QR = 4.
perimeter = 6 + 4 + PR
perimeter = PR + 10 Equation 1
We can find the perimeter using the given information.
perimeter = 3 * PQ
perimeter = 3 * 6
perimeter = 18
Now we replace perimeter with 18 in equation 1 and solve for PR.
18 = PR + 10
Subtract 10 from both sides.
8 = PR
Answer: PR = 8
