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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.

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Date:___________________

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

Q 1: A sector has radius is 8 cm. Find the length of an arc of the sector if its area is given by 480 sq cm.
120 cm
120 cm
180 cm
160 cm

Q 2: The length of an arc of a sector whose radius is 7 cm, is 16.8 cm. Find its area.
98.6 sq cm
58.8 sq cm
48.8 sq cm
38.2 sq cm

Q 3: The length of an arc of a sector is 20 cm. Find the radius if the area of the sector is given by 120 sq cm.
12 cm
14 cm
16 cm
13 cm

Q 4: The length of an arc of a sector whose radius is 28 cm, is 132 cm. Find its area.
1848 sq cm
1849 sq cm
1263 sq cm
1346 sq cm

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Question 6: This question is available to subscribers only!


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