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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
9.21 Perimeter of a Sector

Example:
The area of a sector whose radius is 8 cm is 120 sq cm. Find the perimeter of the sector.

Solution:
Given that,
A = 120 sq cm and r = 8 cm.
Formula A = lr/2
l = 2A/r
l = (2*120) / 8
Therefore, l = 30 cm.
Hence the perimeter of the sector = r + r + l
= 8 + 8 + 30
= 46 cm.


Directions: Read the above example carefully and answer the following questions. Also make 10 different examples of your own.
Q 1: The radius of a sector is 16.8 cm. Find its area if the perimeter of the sector is given by 17.6 cm.
147.84 sq cm
148.25 sq cm
187.13 sq cm
186.61 sq cm

Question 2: This question is available to subscribers only!


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