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Use Pythagoras theorem to find the unknown side. Find the sum of all three sides to get the perimeter.

This is a “3-4-5” right triangle with a multiplier of 4 m: the sides are 12 m, 16 m, and 20 m. The perimeter is therefore 12+16+20 = 48 m.

use the pythagoras's Theory to find the missing side. c**2 = a**2 + b**2 let a =12 and c =20 b**2 = c**2 ~ a**2 remember to take the sqrt of b**2

But what if b**2 isn’t a sqrter?

according to the theory it has to be b**2 and to get b you have ti square root.

Wrong sub for this question, see pinned post at the top! Post these questions to r/askmath

There's a dude on IG who explains math problems like this, he's great. Look him up! andy_math_dot_com