Learn on PengiPengi Math (Grade 7)Chapter 8: Geometric Figures and Scale Drawings

Lesson 4: Volume of Prisms and Cylinders

In this Grade 7 Pengi Math lesson from Chapter 8, students apply the general volume formula V = Bh to calculate the volume of prisms and cylinders, including using the area of a circular base multiplied by height. Students also practice solving for missing dimensions such as height or radius when given a volume, and work through problems involving partial cylinders and unit conversions.

Section 1

Volume Calculation for Prisms

Property

The volume of any prism can be calculated using the formula V=B×hV = B \times h, where BB is the area of the base and hh is the height. Different prisms with the same base area and height will have the same volume, regardless of the shape of their base.

Examples

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

Converting Volume Units

Property

To convert between units of volume, you must cube the linear unit conversion factor. If the linear conversion is 1 unit A=k unit B1 \text{ unit A} = k \text{ unit B}, then the volume conversion is:

1 unit A3=k3 unit B31 \text{ unit A}^3 = k^3 \text{ unit B}^3

Examples

Book overview

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Chapter 8: Geometric Figures and Scale Drawings

  1. Lesson 1

    Lesson 1: Scale Drawings and Scale Factors

  2. Lesson 2

    Lesson 2: Similarity and Proportional Reasoning

  3. Lesson 3

    Lesson 3: Properties of 3D Figures: Prisms and Pyramids

  4. Lesson 4Current

    Lesson 4: Volume of Prisms and Cylinders

Lesson overview

Expand to review the lesson summary and core properties.

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Section 1

Volume Calculation for Prisms

Property

The volume of any prism can be calculated using the formula V=B×hV = B \times h, where BB is the area of the base and hh is the height. Different prisms with the same base area and height will have the same volume, regardless of the shape of their base.

Examples

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

Converting Volume Units

Property

To convert between units of volume, you must cube the linear unit conversion factor. If the linear conversion is 1 unit A=k unit B1 \text{ unit A} = k \text{ unit B}, then the volume conversion is:

1 unit A3=k3 unit B31 \text{ unit A}^3 = k^3 \text{ unit B}^3

Examples

Book overview

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

Continue this chapter

Chapter 8: Geometric Figures and Scale Drawings

  1. Lesson 1

    Lesson 1: Scale Drawings and Scale Factors

  2. Lesson 2

    Lesson 2: Similarity and Proportional Reasoning

  3. Lesson 3

    Lesson 3: Properties of 3D Figures: Prisms and Pyramids

  4. Lesson 4Current

    Lesson 4: Volume of Prisms and Cylinders