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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
3.37 Area of a Sector - I

Example:
The radius of a circle is 21cm. An arc AB subtends an angle of 105 at the center O. Find that area of the sector OAB.

Solution:
The area of the sector = x/360 * p r2
Given that,
r = 21 cm., x = 105.
A = 105/360 * 22/7 * 21 * 21
A = 105/40 * 22 * 7
A = 16170/40
A = 404.25 Sq. 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 radius of a circle is 16.8 cm. An arc AB subtends an angle of 70 at the center O. Find that area of the sector OAB.
173.48 sq.cm.
170.48 sq.cm.
172.48 sq.cm.
171.48 sq.cm.

Q 2: The radius of a circle is 35 cm. An arc AB subtends an angle of 130 at the center O. Find that area of the sector OAB.
1390.28 sq.cm.
1392.28 sq.cm.
1391.28 sq.cm.
1389.28 sq.cm.

Q 3: The radius of a circle is 14.7 cm. An arc AB subtends an angle of 72 at the center O. Find that area of the sector OAB.
None of these
136.83 sq.cm.
134.83 sq.cm.
135.83 sq.cm.

Q 4: The radius of a circle is 2.1 cm. An arc AB subtends an angle of 80 at the center O. Find that area of the sector OAB.
3.08 sq.cm.
2.08 sq.cm.
None of these
4.08 sq.cm.

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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