Question

Find the perimeter of triangle PQR. Round your answer to the nearest tenth.

Triangle PQR is shown. P is at negative 2, 1. Q is at 6, 1. R is at 4, negative 3.
19.7 units
16 units
8 units
7.2 units

Answer 1

P(-2,1), Q(6,1), R(4,-3)

`PQ^2=(-2 -6)^2+(1-1)^2=8^2`

`PR^2 = (-2 -4)^2 + (1 - -3)^2 = 6^2+4^2=52`

`QR^2=(6-4)^2+(1--3)^2=20`

`\textrm{perimeter} = √(8^2)+ √(52) + √(20) \approx 19.7`

First choice