Respuesta :

dannielle

Answer:

115 cm^2

Step-by-step explanation:

The surface is

5^2+4*5*9/2=25+90=115 cm^2

upandover

Step 1) Find the area of the base

5 x 5 = 25

Step 2) Find the area of the triangles

1/2(5 x 9) = 22.5

22.5 x 4 = 90

Step 3) Find the total surface area of the pyramid

SA = 25 + 90

SA = 115 cm^2

Hope this helps! :)