Find the diameter of the circumference.
Circumference : 3.14
㉠ a circle with a radius of 4 cm
㉡ a circle with a diameter of 10 cm
㉢ A circle with a circumference of 21.98 cm.
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Answer:
8 centimetre ,,15 centimetre ,,31.98 centimetre
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1
The circumference of the circle is,
2πr=31.4
⇒2×3.14×r=31.4
⇒r=
2×3.14
31.4
⇒r=5 cm
Then area of the circle is,
πr
2
=3.14×5×5
=78.5 cm
2
Therefore, the radius and the area of the circle are 5 cm and 78.5 cm
2
respectively.
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