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Circle of radius 3 cm: find the area
A circle has a radius of 3 cm. Find the area of this circle.
Answer
Area 28.27
Step-by-step
- π × 3 × 3 = 28.27Circle area = πr²
Why it works
The area of a circle is pi times the square of the radius, so the radius is squared first and then multiplied by pi.
Common mistakes
- Treating the radius 3 cm as if it were the diameter.
- Using 2 × 3.14 × 3, which is the circumference formula.