Digits, Grade 7, Volume 1, Homework Helper

5-4: Surface Areas of Right Pyramids

Part 1

Example Finding Lateral Area of Pyramids from Nets

To the nearest square foot, what is the lateral area of each pyramid whose net is shown below?

  • a. net

  • b. net

  • c. net

Solution

  • a. Step 1 Find the area of each face.

    front, back, left, and right faces

    table with 3 rows and 2 columns , row1 column 1 , eh , column 2 equals , 1 half , b h , row2 column 1 , , column 2 equals , 1 half , middle dot 6 middle dot 7 , row3 column 1 , , column 2 equals 21 , ft squared , end table

    A net of a pyramid.

    Step 2 Find the lateral area of the pyramid.

    table with 3 rows and 2 columns , row1 column 1 , cap lateralarea , column 2 equals . sumoftheareasofthefaces , row2 column 1 , , column 2 equals 21 plus 21 plus 21 plus 21 , row3 column 1 , , column 2 equals 84 , ft squared , end table


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Table of Contents

Digits, Grade 7, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Expressions, Equations, and Relationships Unit C: Measurement and Geometry Unit D: Proportionality English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties