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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
9.7 Diameter of a Circle - I

Example:
The perimeter of a semicircle is 30 cm. Find its diameter.

Solution:
Let the radius of the circle be r cm.
Given that,
The perimeter of the semicircle (2+p)r = 30cm.
(2 + 22/7) * r = 30
36/7 * r = 30.
\ (30*7)/36
5.8333.......cm.
5.8 cm. (approximately)
\ Diameter of the semicircle = 2r
= 2 * 5.8
= 11.6 cm.


Directions: Read the above example carefully and answer the following questions. Draw 6 different semicircles. Find the radius and perimeter of each of them.

Q 1: The perimeter of a semicircle is 54.5 cm. Find its diameter.
22 cm
23 cm
21.2 cm
22.2 cm

Q 2: The perimeter of a semicircle is (14 x16)/10 cm. Find its diameter.
9.71 cm
6.71 cm
8.71 cm
2.71 cm

Q 3: The perimeter of a semicircle is 22x units. Find its diameter.
13.02x units
13.52x units
14.01x units
14.52x units

Q 4: The perimeter of a semicircle is 115.69 cm. Find its radius.
19.5 cm
39.5 cm
29.5 cm
22.5 cm

Q 5: The perimeter of a semicircle is 144 cm. Find its radius.
23 cm
29 cm
28 cm
24 cm

Q 6: Find the perimeter of the semicircle if its diameter is given by 28 cm.
2.8 cm
1.6 cm
16 cm
72 cm

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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