Question

3 cm
3 cm
Surface Area
3 cm
=
[?] cm²
Enter

Answer 1

27cm²

Step-by-step explanation:

We should split this shape into 1 sqaure and 4 triangles.

For the square, it has length 3 and width 3 so the area is 9 square cm

For a triangle, it has the vertical height 3 and length 3. the formula for area of a triangle is ½bh. ½9 = 4.5. Since we have 4 triangles, multiply this by 4 to get 18 square cm.

18 + 9 = 27 so final answer is 27cm²