Correct Answer - Option 1 :
441π cm2, 42π cm
Given:
The radius of a circle is 21 cm.
Formula:
Area of a circle = πr2
Circumference of a circle = 2πr
Where r = radius of a circle.
Calculation:
Area of the circle = πr2
So, Area would be π × 21 cm × 21 cm = 441π cm2
Circumference of a circle = 2πr
So, Circumference would be 2 × π × 21 cm = 42π cm
∴ The area and the circumference of the circular ground are 441π cm2 and 42π cm respectively.