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Date:___________________

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Grade 7 - Mathematics
9.20 Angle of a Sector

Example:
Find the angle of a sector of a circle whose area is 1/4th of the circle.

Solution:
Area of a circle = pr2.
Area of a sector is = q/360opr2.
Here (1/4)pr2 = (q/360o)pr2.
i.e 1/4 = q/360o
i.e q = 360/4 = 90o.


Directions: Read the above example carefully and answer the following questions. Also write 10 examples of your own.


Name: ___________________

Date:___________________

Grade 7 - Mathematics
9.20 Angle of a Sector

Q 1: Find the angle of the sector of a circle whose area is 3/5 of the circle.
None of these
216
238
228

Q 2: Find the angle of the sector of a circle whose area is 7/4 of the circle.
605
680
630
675

Q 3: Find the radius of a circle if the angle of the sector of a circle is given by 270. The area of the sector is 3/4 of the area of the circle which is 90 cm2.
6.35 cm
7.35 cm
8.35 cm
5.35 cm

Q 4: Find the angle of the sector of a circle whose area is 5/12 of the circle.
140
160
None of these
150

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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