Question

What is the circumference of a circle of diameter 10 cm?

(a) 35 cm

(b) 30 cm

(c) 31.4 cm

(d) None of these

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Answer 1

bhai iska right answer h 'C'

31.4

Answer 2

Diameter = 10 cm ..

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

• 2r = Diameter

$\mapsto \rm \: circumference = \pi \: d$

• d = 10cm
• π = 3.14

$\mapsto \rm \: circumference = 3.14 \times 10 \: cm$

$\mapsto \rm \: 31.4 \: cm$

$\bf{Option C}$