Question

(2) The following are perimeters of different circles. Find out the radius -
1.500 metre
2. 100 metre
3. 22 cm
4. 11 cm​

Answer 1

Answer:

1. 500 m

$c \: = 2\ \pi \: r$

$r = \frac{c}{2\pi} = \frac{500}{2.\pi} = 79.58m$

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2. 100 m

$c \: = 2 \: \pi \: r$

$r = \frac{c}{2\pi} = \frac{100}{2.\pi} = 15.9m$

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3. 22cm

$c = 2 \: \pi \: r$

$r = \frac{c}{2\pi} = \frac{22}{2.\pi} = 3.5cm$

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4. 11cm

$c = 2 \: \pi \: r$

$r = \frac{c}{2\pi} = \frac{11}{2.\pi} =1.75cm$

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