Lesson 14
Surface Area of Right Prisms
Let’s look at the surface area of prisms.
Problem 1
Edge lengths are given in units. Find the surface area of each prism in square units.
![Five prisms.](https://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=AKIAXQCCIHWF3XOEFOW4%2F20240726%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240726T235930Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=71582724d306a53db60770799f9ca440d6b61f3580e571c3dba521df65d16b4b)
Problem 2
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://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=AKIAXQCCIHWF3XOEFOW4%2F20240726%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240726T235930Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=8bbf3a73379dbb4a9b3ec81b5aa714e33a7f9560d1d597357a79b89c92808bb8)
Problem 3
\(B\) 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://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=AKIAXQCCIHWF3XOEFOW4%2F20240726%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240726T235930Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=1b3eaaa0f9115b1b7dfa1d6d6b9379aecab38d4ec258556a10ea4fa433480a70)
Problem 4
Write each expression with fewer terms.
- \(12m-4m\)
- \(12m-5k+m\)
- \(9m+ k-(3m-2k)\)
Problem 5
- Find 44% of 625 using the facts that 40% of 625 is 250 and 4% of 625 is 25.
- What is 4.4% of 625?
- What is 0.44% of 625?