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Mathematics 21 Online
OpenStudy (anonymous):

The surface area of a rectangular prism is 60 in.² and its lateral area is 44 in.² The area of a base of the prism is _____ in.². I dont want any answers i want to find out how to set it up.

OpenStudy (mathstudent55):

This is a rectangular prisim

OpenStudy (mathstudent55):

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OpenStudy (mathstudent55):

How many faces does the prism have?

OpenStudy (anonymous):

5.

OpenStudy (mathstudent55):

Top, bottom, front, back, right, left Total of 6 faces

OpenStudy (anonymous):

Oh. Okay.

OpenStudy (mathstudent55):

The top and bottom faces are called the bases.

OpenStudy (anonymous):

Yes.

OpenStudy (mathstudent55):

The other faces, front, back, left, and right, are the faces whose area is called the lateral area.

OpenStudy (mathstudent55):

Each pair of opposite faces havethe same area.

OpenStudy (mathstudent55):

The top base and the bottom base have the same area. The front face and the back face have the same area. The left face and the right face have the same area.

OpenStudy (mathstudent55):

You know the total surface area. That is the area of all 6 faces added together.

OpenStudy (mathstudent55):

You also know the lateral area. that is the area of the front, back, left and right faces added together.

OpenStudy (mathstudent55):

If you subtract the lateral area from the total area, you get the area of both bases.

OpenStudy (mathstudent55):

Since both bases are congruent rectangles and have the same area, if you divide the area of the bases by 2 you get the area of each base.

OpenStudy (anonymous):

so the bases are both 8?

OpenStudy (mathstudent55):

Yes. 60 in^2 - 44 in^2 = 16 in^2 16 in^2 / 2 = 8 in^2

OpenStudy (anonymous):

so the answer to the problem is 8in^2? right?

OpenStudy (mathstudent55):

Correct

OpenStudy (anonymous):

omg thank you so muchhh!!

OpenStudy (mathstudent55):

you're welcome

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