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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.
148.25 sq cm
147.84 sq cm
186.61 sq cm
187.13 sq cm

Q 2: The area of a sector is 985.6 sq cm. Find the radius if the perimeter of the sector is given by 126.4 cm.
17 cm
22 cm
28 cm
24 cm

Q 3: The area of a sector is 288.75 sq cm. Find the radius if the perimeter of the sector is given by 69.5 cm.
17 cm
19 cm
27 cm
21 cm

Q 4: The area of a sector whose radius is 14 cm is 123.2 sq cm. Find the perimeter of the sector.
15 cm
17.6 cm
45 cm
45.6 cm

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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