Page 657 - Basic College Mathematics with Early Integers

634 C HAPTE R 9 I GEOMETRY

diameter
diameter = 2 # radius Also: radius =
2

T T T T T
d
#
d = 2 r r =
2
PRACTICE 3 Example 3 Find the diameter of the circle.
Find the radius of the circle.

5 cm
16 in.

Solution: The diameter is twice the radius.
d = 2 r
#
#
d = 2 5 cm = 10 cm
The diameter is 10 centimeters.

Work Practice 3

Objective Identifying Solid Figures

Recall from Section 9.1 that space extends in all directions indefinitely.
A solid is a figure that lies in space. Solids have length, width, and height or
depth.
A rectangular solid is a solid that consists of six sides, or faces, all of which are
rectangles.

Height

Width
Length
A cube is a rectangular solid whose six sides are squares.

A pyramid is shown below. The pyramids we will study have square bases and
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heights that are perpendicular to their base.

Height

Square
base
Answer
3. 8 in.