Area of a circle from the diametre
Area = π × radius × radius, with π = 3.14. Halve a diametre to get the radius.
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A circle has a diameter of 74 cm. Find its area. Use π = 3.14.
Answer: 4298.66
A circle has a diameter of 16 cm. Find its area. Use π = 3.14.
Answer: 200.96
A circle has a diameter of 18 cm. Find its area. Use π = 3.14.
Answer: 254.34
Tip: Area = π × radius × radius, with π = 3.14. Halve a diametre to get the radius.
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- Next in this topic Area of a circle: radius or diametre Class 7
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