let's call side the first side a and the second side b
if a = 4.8cm
b = 4.8(3/2) or 4.8 x 1.5 which equals 7.2
if b = 7.2 and a = 4.8 to get the permiter we need to add all 4 sides together as in a + b + a + b
4.8 + 4.8 + 7.2 + 7.2 = 24
Perimeter = 24