Hey there! :)
You have to find the area of all of them and add it together.
Formulas:
Area of a square: l · w
Area of a triangle: (b · h) ÷ 2
Square -
l = 8
w = 8
8 × 8 = 64
Triangle -
b = 8
h = 6
(8 × 6) ÷ 2
48 ÷ 2 = 24
There are 4 triangles
24 × 4 = 96
96 + 64 = 160
The surface area ⇒ 160 cm²
