Learn on PengiReveal Math, Course 3Module 10: Volume

Lesson 10-1: Volume of Cylinders

In this Grade 8 lesson from Reveal Math, Course 3 (Module 10), students learn how to calculate the volume of a cylinder using the formula V = πr²h, applying it to problems where either the radius or diameter is given. Students practice expressing volume in terms of π as an exact answer and as a decimal approximation rounded to the nearest tenth. The lesson also extends to multi-step real-world problems, such as finding the weight of a cylindrical object by multiplying its calculated volume by a given unit weight.

Section 1

Volume of a Cylinder

Property

Volume is the amount of space contained within a three-dimensional object. It is measured in cubic units, such as cubic feet or cubic centimeters.

Cylinder Volume Formula:

Section 2

The Height and Volume of Cylinders

Property

A cylinder is a solid figure with two parallel circular bases of the same size. For a cylinder with radius rr and height hh:

Volume: V=πr2hV = \pi r^2 h or V=BhV = Bh (where BB is the area of the base)

Section 3

Area of circles

Property

For a circle with radius rr:
The area is A=πr2A = \pi r^2.
The number π\pi (pi) is a constant used for all circles. For exact answers, leave the symbol π\pi in the solution. For approximate answers, use π3.14\pi \approx 3.14 or π227\pi \approx \frac{22}{7}.

Examples

Book overview

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Module 10: Volume

  1. Lesson 1Current

    Lesson 10-1: Volume of Cylinders

  2. Lesson 2

    Lesson 10-2: Volume of Cones

  3. Lesson 3

    Lesson 10-3: Volume of Spheres

  4. Lesson 4

    Lesson 10-4: Find Missing Dimensions

  5. Lesson 5

    Lesson 10-5: Volume of Composite Solids

Lesson overview

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Section 1

Volume of a Cylinder

Property

Volume is the amount of space contained within a three-dimensional object. It is measured in cubic units, such as cubic feet or cubic centimeters.

Cylinder Volume Formula:

Section 2

The Height and Volume of Cylinders

Property

A cylinder is a solid figure with two parallel circular bases of the same size. For a cylinder with radius rr and height hh:

Volume: V=πr2hV = \pi r^2 h or V=BhV = Bh (where BB is the area of the base)

Section 3

Area of circles

Property

For a circle with radius rr:
The area is A=πr2A = \pi r^2.
The number π\pi (pi) is a constant used for all circles. For exact answers, leave the symbol π\pi in the solution. For approximate answers, use π3.14\pi \approx 3.14 or π227\pi \approx \frac{22}{7}.

Examples

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Module 10: Volume

  1. Lesson 1Current

    Lesson 10-1: Volume of Cylinders

  2. Lesson 2

    Lesson 10-2: Volume of Cones

  3. Lesson 3

    Lesson 10-3: Volume of Spheres

  4. Lesson 4

    Lesson 10-4: Find Missing Dimensions

  5. Lesson 5

    Lesson 10-5: Volume of Composite Solids