Answer:
D) 380cm^2
Step-by-step explanation:
In order to find the surface area, find the area of each side then add them all.
The formula for this would be:
base area + 4(side area)
To find the area of the base multiply 10 by 10
10 x 10 = 100
To find the area off the triangle sides multiply the width (10) by the height (14) and divide by 2
(14 x 10) ÷ 2 = 70
Because there are four sides, multiply 70 by 4 then add the product to 100
70 x 4 + 100 = 380cm^2
