Question 829408
An isosceles triangle has two equal sides. 
We know the base = 26 cm.
x + x + 26 = 72 cm
combine like terms, the xs
2x + 26 = 72 cm
subtract 26 from both sides
2x=46
divide both sides by 2 to get the x by itself
x=23

The length of the equal sides is 23 cm.

check your answer: 23+23+26=72
72=72