2 Answers

Kevin Viggers · Answer 1 · 2018-12-05T02:40:51+0000

The area of a circle with a diameter of twenty-one is roughly 346 or 346.36 to be exact.

- Divide the diameter by two to find the radius.

- Square the radius & Multiply by Pi

IGRACH · Answer 2 · 2018-12-09T22:44:56+0000

area of a circle: πr²

Data:
diameter: 21 cm
radius=diameter/2=21 cm/2=10.5 cm

area of this circle: π(10.5 cm)²=110.25π cm² (≈346.36 cm²)

Answer: area=110.25π cm²

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