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Lesson 5: Surface area

# Surface area word problem example

Akira won a science fair and got a golden pyramid trophy. We want to find out how much gold foil was used. The trophy has a square base and four triangular faces. By calculating the area of these shapes, we can find the total surface area covered by the gold foil.

## Want to join the conversation?

• The video: 😁
The real work: 😈
• why do you have to multiply by 1/2?😕
• Since the triangle is half of a parallelogram, which is why you multiply it by 1/2.
• can i get a small loan of \$10 million from bill gates?
• sure email him
• Any time you have a 3d surface area, do you have to unfold it all the time to find the area?
• No you can use formulas.
• It’s basically the surface area but without the base/s included
• Why do i have to do 5x3 if im finding the area of a box that has a height of 5 and a width of 3?
• b/c you find area by multiplying length and height
• this is very good. my grandma is a khan academy ambassador
• Why do you have to combine the area of both figures?
• Because you are trying to find the total area.