Hi there!
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I believe your answer is:
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Here’s why:
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I am assuming by the infomation given that the figure is a cube.
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Hope this helps you. I apologize if it’s incorrect.
We are given the coordinate of the 3 vertices. From these coordinates we can find the length of the sides using the distance formula and the sum of all the sides will be equal to the perimeter of the triangle.
Side PQ =

Side QR =

Side RP =

So, the perimeter of the triangle will be 8 + 4.5 + 7.2 = 19.7
You probably misplaced the digits in option A. The correct answer is 19.7 units.
Answer:
Exact Form:
2
√
10
Decimal Form:
6.32455532
Step-by-step explanation:
Use the distance formula to determine the distance between the two points.
√
(
-5+7
)
2
+
(
7
−
1
)
2
Answer:

Step-by-step explanation:

hope this helps
brainliest appreciated
good luck! have a nice day!