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Mathematics 7 Online
OpenStudy (anonymous):

A square pyramid has a base area of 64 ft2. The pyramid’s total surface area is 224 ft2. What is the area of each triangular face? A. 32 ft2 B. 40 ft2 C. 53 ft2 D. 160 ft2 @Pawtpie

OpenStudy (anonymous):

I have one more after this one

OpenStudy (anonymous):

Quick question did I get a medal for the last question?

OpenStudy (anonymous):

no but ill give it

OpenStudy (anonymous):

yes u did

OpenStudy (anonymous):

Okay this time we have a pyramid

OpenStudy (anonymous):

And we need the area of one of the triangular faces

OpenStudy (anonymous):

Okay this should be easy

OpenStudy (anonymous):

The total surface area is 244 ft^2 and the square base takes up 64 ft^2 of this amount. So how much surface area is made up of the triangle faces?

OpenStudy (anonymous):

|dw:1421037919660:dw|

OpenStudy (anonymous):

Good drawing, it should look like this

OpenStudy (anonymous):

|dw:1421037993749:dw|

OpenStudy (anonymous):

This would be all of the sides of a pyramid

OpenStudy (anonymous):

what is that LOL

OpenStudy (anonymous):

I broke apart the pyramids into sides

OpenStudy (anonymous):

So what is the total surface area according to the question?

OpenStudy (anonymous):

224

OpenStudy (some.random.cool.kid):

cant you just divide all this why make it so complicated

OpenStudy (anonymous):

To get the area of the four triangle sides we need to subtract the area of the square base from the area of the pyramid.

OpenStudy (anonymous):

THE base ism64

OpenStudy (some.random.cool.kid):

with area you multiply/divide subtracting is for perimeter why would she subtract?

OpenStudy (anonymous):

Because we have to subtract the area of the square from the area of the pyramid before we can divide to get the area of one of the triangular sides.

OpenStudy (anonymous):

So 224 - 64 is?

OpenStudy (anonymous):

2160

OpenStudy (some.random.cool.kid):

"The pyramid’s total surface area is 224 ft2. What is the area of each triangular face?" end of qoute i dont see how you figure that but as long as she understands then i guess its ok :}

OpenStudy (anonymous):

Did you mean 160?

OpenStudy (anonymous):

its ok @some.random.cool.kid

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

So 160 ft.^2 is the area taken up by 4 triangular sides, so to get the area of one side we have to?

OpenStudy (anonymous):

|dw:1421038706281:dw|

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