Find the radius from the area
Work backwards: undo the formula to find the radius.
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A circle has an area of 1384.74 cm². Use π = 3.14. What is its radius, in cm?
Answer: 21
A circle has an area of 153.86 cm². Use π = 3.14. What is its radius, in cm?
Answer: 7
A circle has an area of 6358.5 cm². Use π = 3.14. What is its radius, in cm?
Answer: 45
Tip: Work backwards: undo the formula to find the radius.
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- Next in this topic Area of a semicircle or quarter circle Class 7
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