Page 10 - Math Course 2 (Book 2)

Geometric Surface Area: Prisms
Mo. 7

Lesson 1 lateral area

The lateral area L is the sum of the areas of the
lateral faces.

KEY CONCEPTS:
1. Find lateral areas of prisms.
2. Find surface area of prisms. a b c d e f

h
MO. 7 - L1a

Prisms: Finding the Lateral

and Surface Areas

Vocabulary A-Z L = ah + bh + ch + dh + eh + fh

Let us learn some vocabulary = h(a + b + c + d + e + f )
=Ph

Key Concept

base
lateral edge
Lateral Area of a Prism

lateral face
If a right prism has a lateral area of L square units,
a height of h units, and each base has a perimeter
altitude of P units, then L = Ph.
base P

h
lateral faces
The rectangular faces that are not bases are called
lateral faces.

lateral edges
The lateral faces intersect at the lateral edges.
Lateral edges are parallel segments. Surface Area of a Prism

right prism If the surface area of a right prism is T square
A prism with lateral edges that are also altitudes is units, is lateral area is L square units, and each
called a right prism. base has an area of B square units, then T = L + 2B

h

2