# Help with math? Please!

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This image shows a square pyramid.

What is the surface area of this square pyramid?

36 ft²

72 ft²

78 ft²

84 ft²

This image shows a square pyramid.

What is the surface area of this square pyramid?

36 ft²

72 ft²

78 ft²

84 ft²

##### 1 Answer

Mar 27, 2018

36

#### Explanation:

surface area is lateral

a perpendicular line from the top angle to the bottom is a perpendicular bisector so the line is now 3 and 3

so in triangle one (as i named it) we have a isosceles triangle (45-45-90) or a special right triangle (x-x-x

the area of triangle one is

the total suface area is