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The accuracy of estimated perimeter can be evaluated by
comparing the estimated value with the measured value. The
smaller the difference between the values of estimated perimeter Besides using grid
and measured perimeter, the more precise the estimated value. paper or graph paper,
discuss other methods
which can be used to
id ou now estimate the perimeter

Percentage error of a shape.
Difference between estimated value and actual value
= × 100%
Actual value
The smaller the percentage error, the more precise the estimated value.

Self Practice 10.1b

1. Estimate the perimeter of each of the following shapes. Hence, measure the perimeter
of the shape by using a ruler or a thread to evaluate the accuracy of estimation.
(a) (b)
1 cm 2 cm

1 cm
2 cm

How do you solve problems? LEARNING
CHAPTER
10 STANDARDS
Solve problems
involving perimeter.
The diagram shows the parking
area in front of a shopping mall. 35 m
The shopping mall management Shopping C D
intends to fence up the entire mall
parking area, except the main Main A 45 m B
entrance and another side entrance 8 m
entrance. If the cost of fencing L 8 m M Parking area E 12 m F
is RM80 per metre, what will
be the cost incurred by the 32 m 30 m
shopping mall? Side entrance
K G
J H
10 m

228
Chapter 10

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