Math CentralQuandaries & Queries

Question from Livvy:

a square with a perimeter of 48 and a triangle with a perimeter of 38. when they are joined they make a pentagon. please find the perimeter
how can you find the perimeter of this. could you please help me?

Hi Livvy,

If a square has a perimeter of 48 units what is the length of a side?

I drew your square and placed a triangle with perimeter 38 units on top of the square to form a pentagon. I drew the perimeter of the pentagon in red.


What is the length of the perimeter of the pentagon?


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