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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

Respuesta :

DeanR

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

[tex]PQ^2=(-2 -6)^2+(1-1)^2=8^2[/tex]

[tex]PR^2 = (-2 -4)^2 + (1 - -3)^2 = 6^2+4^2=52[/tex]

[tex]QR^2=(6-4)^2+(1--3)^2=20[/tex]

[tex]\textrm{perimeter} = \sqrt{8^2}+ \sqrt{52} + \sqrt{20} \approx 19.7[/tex]

First choice

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