# Math

what is the surface area of the rectangular prism?

length: 21.5mm
height: 5mm
Width: 4mm

A. 480MM^2
B. 427MM^2****
C. 213.5MM^2
D. 255MM^2

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1. Each side will have different lengths. You want to figure out the area of each side. There are 6 sides. Each side will be the same on opposite sides. So you multiply

21.5*5=107.5
21.5*4=86
4*5=20

Once you add them all you get 213.5.
You then multiply 213.5 by 2 too get the answer.

You multiply by 2 since each side is the same on opposite sides.

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2. ok thx

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3. Can anyone help me with Lesson 10: Prisms and Surface Area Math 6 Unit 3: Geometry and Measurement test answers

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4. so is it 213.5.5 or 427

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5. I need help

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6. its 427

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