CalcElfCalcElf › Circle of radius 4 cm: find the area
Circle of radius 4 cm: find the area
A circle has a radius of 4 cm. Find the area of this circle.
Answer
Area 50.27
Step-by-step
- π × 4 × 4 = 50.27Circle 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 4 cm as if it were the diameter.
- Using 2 × 3.14 × 4, which is the circumference formula.