Respuesta :

Kaikerscupcake
Hey there! :D

We know that:

- the perimeter is all the sides added up

- Both pairs of opposite sides have the same length. 

Two sides are equal to 4. 

4*2= 8

23-8= 15

Since the other side (or both lengths) are equal in length, divide 15 by 2. 

15/2= 7.5

The length is equal to 7.5. 

I hope this helps!
~kaikers

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