Question

help ? much appreciate it

Answer 1

ps. if u could show me how u do it

Answer 2

Perimeter = sum of all sides.

So, formulate the expression for the perimeters of both shapes, equate them and solve for the missing value.

Answer 3

starting with the square:
x+3=8
x=5
so PS of oblong equals 4cm, (5-1)

since both square and oblong have same perimeter
5+5+5+5=2*4+2*PQ
(20-8)/2=PQ=6cm