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The perimeter of a triangle is 31 cm side number one and side number two are the same length wall side number three is 1 cm shorter than twice the length of side one. What is the third side?

Respuesta :

let the length of side number one and two be x

length of side number three = 2x-1

x + x + 2x - 1 = 31

4x=32

x=8

2x-1= 15

length of third side = 15cm

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