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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
3.39 Perimeter of a Sector

Example:
The area of a sector whose radius is 9cm is 130 sq.cm. Find the perimeter of the sector.

Solution:
Given that,
A = 130 sq.cm., r=9 cm.
Formula A = lr/2
Therefore, l = 2A/r
l = (2*130)/9
l = 28.89 cm.
Hence the perimeter of the sector = 2r + l
= 2*9 + 28.89
= 46.89 cm.


Directions: Solve the following problems and correct the answer at two decimal place. Also write at least ten examples of your own.
Q 1: The area of a sector whose radius is 8 cm is 150 sq.cm. Find the perimeter of the sector.
52.5 Sq.cm.
55.5 Sq.cm.
54.5 Sq.cm.
53.5 Sq.cm.

Q 2: The area of a sector whose radius is 14.7 cm is 245 sq.cm. Find the perimeter of the sector.
63.73 Sq.cm.
60.73 Sq.cm.
62.73 Sq.cm.
61.73 Sq.cm.

Q 3: The area of a sector whose radius is 15 cm is 230 sq.cm. Find the perimeter of the sector.
None of these
61.67 Sq.cm.
59.67 Sq.cm.
60.67 Sq.cm.

Q 4: The area of a sector whose radius is 16.3 cm is 280 sq.cm. Find the perimeter of the sector.
97.96 Sq.cm.
94.96 Sq.cm.
65.96 Sq.cm.
66.96 Sq.cm.

Q 5: The area of a sector whose radius is 21.3 cm is 330 sq.cm. Find the perimeter of the sector.
73.59 Sq.cm.
72.59 Sq.cm.
75.59 Sq.cm.
74.59 Sq.cm.

Q 6: The area of a sector whose radius is 7.8 cm is 130 sq.cm. Find the perimeter of the sector.
47.93 Sq.cm.
48.93 Sq.cm.
None of these
49.93 Sq.cm.

Q 7: The area of a sector whose radius is 9.6 cm is 170 sq.cm. Find the perimeter of the sector.
55.32 Sq.cm.
54.32 Sq.cm.
56.32 Sq.cm.
53.32 Sq.cm.

Q 8: The area of a sector whose radius is 8.6 cm is 155 sq.cm. Find the perimeter of the sector.
52.22 Sq.cm.
54.22 Sq.cm.
55.22 Sq.cm.
53.22 Sq.cm.

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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