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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

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

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
5.8 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 22x units. Find its diameter.
13.52x units
14.01x units
14.52x units
13.02x units

Question 2: This question is available to subscribers only!

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