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Grade 7 - Mathematics
9.22 The Area of a Sector - II

Example:
The length of an arc of a sector whose radius is 8 cm, is 10 cm. Find its area.

Solution:
Given that,
l = 10 cm, and r = 8 cm.
Formula A = lr/2
Therefore, A = (10 * 8) / 2
A = 80 / 2
A = 40 sq cm.


Directions: Read the above example carefully and answer the following questions. Also make 10 examples of your own.
Q 1: A sector has radius is 15 cm. Find the length of an arc of the sector if its area is given by 1125 sq cm.
121 cm
112 cm
150 cm
125 cm

Question 2: This question is available to subscribers only!


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