Respuesta :

Annameme

Answer:

170cm²

Step-by-step explanation:

so the middle rectangle part first

15x10=150

then there's triangles so i'm gonna skip the divided by 2 part.

5x4=20

150+20=170

Solution:

Note that:

  • Surface area = 2(Area of triangle) + 3(Area of rectangle)

Finding the area of triangle:

  • Area of triangle = 1/2 x 4 x 5
  • => Area of triangle = 1/2 x 20
  • Area of triangle = 10 cm²

Finding the area of rectangle:

  • Area of rectangle = 5 x 10
  • => Area of rectangle = 50 cm²

Using the formula of surface area:

  • Surface area = 2(Area of triangle) + 3(Area of rectangle)
  • => Surface area = 2(10) + 3(50)
  • => Surface area = 20 + 150
  • => Surface area = 170 cm²