Lesson 14

Surface Area of Right Prisms

Problem 1

Edge lengths are given in units. Find the surface area of each prism in square units.

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.

Solution

(From Unit 7, Lesson 11.)

Problem 3

$$B$$ is the intersection of line $$AC$$ and line $$ED$$. Find the measure of each of the angles.

1. Angle $$ABF$$

2. Angle $$ABD$$

3. Angle $$EBC$$

4. Angle $$FBC$$

5. Angle $$DBG$$

Solution

(From Unit 7, Lesson 5.)

Problem 4

Write each expression with fewer terms.

1. $$12m-4m$$
2. $$12m-5k+m$$
3. $$9m+ k-(3m-2k)$$

Solution

(From Unit 6, Lesson 20.)

Problem 5

1. Find 44% of 625 using the facts that 40% of 625 is 250 and 4% of 625 is 25.
2. What is 4.4% of 625?
3. What is 0.44% of 625?