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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
9.5 Diameter of a Circle - II

Example:
The area of a circle is 9.625 sq cm. Find its diameter.

Solution:
Given that,
The area of a circle (A) = 9.625 sq cm.
If the radius of the circle is r cm.
A = pr2.
9.625 = 22/7 * r2
r2 = (9.625 * 7) / 22
r2 = 3.0625
Take square roots on both sides.
r = 1.75
Therefore, the radius of the circle is 1.75 cm.
So, the diameter = 2r = 2 * 1.75 = 3.5 cm.


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

Q 1: The area of a circle is 6.16 sq cm. Find its radius.
1.4 cm
14 cm
28 cm
2.8 cm

Q 2: Find the area of the circle if its radius is given by 0.35 cm.
1.4 sq cm
0.385 sq cm
1.54 sq cm
1 sq cm

Q 3: The area of a circle is 8662.5 sq cm. Find its diameter.
10.5 cm
55.5 cm
210.12 cm
105.02 cm

Q 4: The area of a circle is 346.5 sq cm. Find its diameter.
17 cm
15 cm
21 cm
10.5 cm

Q 5: The area of a circle is 498.96 sq cm. Find its radius.
16.51 cm
25.21 cm
12.61 cm
32.5 1cm

Q 6: The area of a circle is 361 sq cm. Find its diameter.
3.25 cm
4.92 cm
6.23 cm
5.55 cm

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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