Page 76 - Math Course 1 (Book 2)

Measurements in Geometry

Length in Customary Units
PRECISION

Examples Find the precision for 15 millimeters. Explain its
meaning.

The measuring tool is divided into millimeter incre-
A. Find the length of DE
ments. Thus, the measurement is precise to within
1
L M (1) or 0.5 millimeter.
2

The precision is 0.5 millimeter.
Answer The measurement could be 14.5
Each inch is divided into sixteenths. Point E is millimeters to 15.5 millimeters.
closer to the 3-inch mark.

DE
Answer Your Turn!
is about 5 inches long.
Length in Metric Units

Find the Length AB.
A. Find the length of FG
A B
F G

Each inch is divided into fourths. Point G is
3
closer to the 2 mark. A. 2 mm
4
B. 1.8 mm
FG C. 18 mm
Answer 3 D. 20 mm
is about 2 inches long.
4
Answer

Precision

Examples Find the Length ON

O N
Precision
3
Find the precision for 32 inches. Explain its
4
meaning.

1
The measuring tool is divided into –inch
4
increments. A. 1 cm
B. 2 cm
1 1
Thus, the measurement is precise to within ( ) C. 2.5 cm
2
4
1
or inch D. 3 cm
8
1
The precision is inch. Answer
8 5
Answer The measurement could be 32
8
7
inches to 32 inches.
8
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