Lesson 12

Prisms and Pyramids

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Problem 1

Give each solid a geometric name. Be as precise as you can.

A

7 sided solid. Hexagon with 6 rectangles meeting on the left side of the solid.  

B

5 sided solid. Two right triangles and 3 rectangles.  

C

An oblique cone, no units labeled. A dotted line representing the height of the cone is drawn perpendicular to the plane in which the base lies.

Solution

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Problem 2

Each set of two-dimensional shapes is the complete list of faces from a particular solid. Match each set of shapes with the solid they came from.

A:

2 congruent triangles and 3 rectangles

B:

4 triangles and 1 rectangle

C:

2 squares and 4 congruent parallelograms

D:

4 congruent, equilateral triangles

1:

right triangular prism

2:

oblique square prism

3:

right triangular pyramid

4:

rectangular pyramid

Solution

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Problem 3

These 3 congruent square pyramids can be assembled into a cube with side length 1 foot. What is the volume of each pyramid?

Rectangular pyramid 
Rectangular pyramid 
Rectangular pyramid 

Solution

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Problem 4

A prism has a height of 4 inches and a volume of 120 cubic inches. Select all figures that could be the base for this prism.

A:

a 5 inch by 6 inch rectangle

B:

a square with side length 5 inches

C:

a circle with radius 5 inches

D:

a star-shaped base with area 30 square inches

E:

a right triangle with legs 5 inches and 12 inches

Solution

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(From Unit 5, Lesson 11.)

Problem 5

This prism has a right triangle for a base. The volume of the prism is 54 cubic units. What is the value of \(h\)?

Prism with base that is triangle A, B C. Angle A, C B is a right angle. C A, length 4. A, B length 5. Second base triangle D E F, Angle D F E is a right angle. C F, length h.

Solution

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(From Unit 5, Lesson 11.)

Problem 6

This solid has curved sides. All cross sections parallel to the base are squares measuring 3 units on each side. The height from the base to the top is 5 units. What is the volume of this solid?

Solid with curved sides. Top and bottom bases are squares, side lengths = 3.

Solution

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(From Unit 5, Lesson 10.)

Problem 7

Find the volume of each solid.

  1. a cylinder with radius 3 inches and height 2 inches
  2. a hexagonal prism whose base has area 4.5 square centimeters and whose height is 7 centimeters
  3. a prism 5 feet tall whose base is a right triangle with leg lengths \(\frac32\) feet and 9 feet

Solution

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(From Unit 5, Lesson 9.)

Problem 8

A circle with area \(\pi\) square units is dilated using a scale factor of 5. What is the area of the dilated circle?

Solution

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(From Unit 5, Lesson 4.)