Question

find the diameter of a circle whose circumference is 66cm taking π 22/ 7​

Answer 1

Answer:

21 cm

Step-by-step explanation:

$circumference = 2 \: \pi \: r$

$66 = 2 \times \frac{22}{7} \times r$

$r = \frac{66 \times 7}{2 \times 22}$

$r = \frac{21}{2}$

Now,

$diameter = 2 \times radius$

$= 2 \times \frac{21}{2}$

$= 21 \: cm$

Hence the diameter is 21 cm.

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Answer 2

Step-by-step explanation:

csa=66 cm

csa=2πr

csa=2×22/7×r

66=2×22/7×r

r=21/2

D=2×r

d=2×21/2

d=21 cm

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