Andy C. answered • 08/24/17

Math/Physics Tutor

Thank you for your appreciation and complements Angela.

You are awesome and amazing! A rare find!

Keep up the good work.

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The perimeter means add up all of the sides.

31 + 48 + ? = 117 , where the missing side is represented by the question mark , ?

79 + ? = 117

Solves the equation by subtracting 79 from both sides

79 + ? - 79 = 117 - 79

? = 38

So the missing side must be 38

It can be checked that 31 + 48 + 38 = 117