5-2: Surface Areas of Right Prisms

Key Concept

The surface area of a three-dimensional figure is the sum of the areas of its faces.

You can find the surface area by finding the area of the net of the three-dimensional figure.

A rectangular prism and its net of four rectangles forming a row. Rectangles are also attached to the top and bottom of the second rectangle.

Part 1


The lateral area (L.A.) of a prism is the sum of the areas of its lateral faces. Do not include the areas of the bases in your sum.

A net with 4 rectangles forming a row: left face, front fact, right face, and back face. The top base and bottom base are rectangles above and below the front face.

Lateral area = area of front face + area of back face + area of right face + area of left face

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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