Lesson 16
Surface Area of Right Prisms
Problem 1
Edge lengths are given in units. Find the surface area of each prism in square units.
![Five prisms.](https://staging-cms-im.s3.amazonaws.com/9vLdafcNcB24rAkVLWQDc1SV?response-content-disposition=inline%3B%20filename%3D%227-7.7.newPP.prismsABCDE09.png%22%3B%20filename%2A%3DUTF-8%27%277-7.7.newPP.prismsABCDE09.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF37H2AMFB%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T070547Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=91516bbf5ea52a9458cb3c01ad59d494f331fb6fccde863f9b50190a98ebb4f3)
Problem 2
Here is the base of a prism.
![An 8-sided figure, all angles right, lengths, centimeters. From the first vertex, a segment extends 8 right, then 5 down, then 3 left, then 2 up, then 2 left, then 2 down, then 3 left, then 5 up.](https://staging-cms-im.s3.amazonaws.com/KENNdq3qzE3XB9M1mn8fnmvp?response-content-disposition=inline%3B%20filename%3D%227-7.6.C3.Image.02.png%22%3B%20filename%2A%3DUTF-8%27%277-7.6.C3.Image.02.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF37H2AMFB%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T070547Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=8d34a429980a0dff47c5eda036e3eb23dbdf5c88953e46e66016a0d4e2855b56)
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If the height of the prism is 5 cm, what is its surface area? What is its volume?
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If the height of the prism is 10 cm, what is its surface area? What is its volume?
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When the height doubled, what was the percent increase for the surface area? For the volume?
Problem 3
Select all the situations where knowing the volume of an object would be more useful than knowing its surface area.
Determining the amount of paint needed to paint a barn.
Determining the monetary value of a piece of gold jewelry.
Filling an aquarium with buckets of water.
Deciding how much wrapping paper a gift will need.
Packing a box with watermelons for shipping.
Charging a company for ad space on your race car.
Measuring the amount of gasoline left in the tank of a tractor.
Problem 4
Priya says, “No matter which way you slice this rectangular prism, the cross section will be a rectangle.” Mai says, “I’m not so sure.” Describe a slice that Mai might be thinking of.
![A rectangular prism.](https://staging-cms-im.s3.amazonaws.com/eKZrz4GZwG9qdoZtL7AjLwJJ?response-content-disposition=inline%3B%20filename%3D%227-7.7.newPP_Image_8mno.png%22%3B%20filename%2A%3DUTF-8%27%277-7.7.newPP_Image_8mno.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF37H2AMFB%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T070547Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=7aa70a5bf6f69c2e1693d5ea2acb6beb8e16bc7e8b04b34a23dc88e5fdeb73b2)
Problem 5
\(B\) is the intersection of line \(AC\) and line \(ED\). Find the measure of each of the angles.
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Angle \(ABF\)
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Angle \(ABD\)
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Angle \(EBC\)
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Angle \(FBC\)
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Angle \(DBG\)
![Two lines and two rays that intersect at point B creating 6 angles.](https://staging-cms-im.s3.amazonaws.com/NY2HeqWfEtjiZPVJDfji5fws?response-content-disposition=inline%3B%20filename%3D%227-7.6.A.PP.Image.11.png%22%3B%20filename%2A%3DUTF-8%27%277-7.6.A.PP.Image.11.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF37H2AMFB%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T070547Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=c78eb0d03de1aa74093fa92436dd7176c759bedf7a083343c156d8b550732ff6)
Problem 6
Write each expression with fewer terms.
- \(12m-4m\)
- \(12m-5k+m\)
- \(9m+ k-(3m-2k)\)