If Kelly wanted to put a protective covering on the four glass walls of the aquarium, how big does the cover have to be?

Surface Area of the Aquarium:

= ( . )( . ) + ( . )( . ) + ( . )( . ) = + + =

We only need to cover the four glass walls, so we can subtract the area of both the top and bottom of the aquarium.

AreaofTop: =. × . =

AreaofBottom: =. × .=

Surface Area of the Four Walls:
= − − =

Kelly would need to cover the four walls of the aquarium.

Def is a scalene triangle