Question

isosceles triangle has two sides of equal length the third is 7 less than twice the length of one of the other sideside the perimeter is 44cm. what is the length I'd the 3rd side?

Answer 1

Answer:

Is 18.5cm

just took it and got it right

Answer 2

If your asking for the length of the third side, to find it first we have to build an equation.

let's take x as the length of the two sides with the same length. 
so your equation should be, 

x+x+2x-7=44cm 
=4x-7=44cm
     +7  +7
=4x=51cm
 ÷4   ÷4
=x=12.75cm

length of the sides with equal length= 12.75cm
length of the 3rd side= 12.75×2-7=18.5cm

check,
12.75cm+12.75cm+18.5cm=44cm
hope this helps.....