The diameter of a circle is 28cm. Find its area.
- A616sq cm
- B308sq cm
- C154sq cm
- D77sq cm
Solution & Step-by-step Explanation
Given diameter (d) = 28cm.
Radius (r)=
2
d
=
2
28
=14cm
The formula for the area of a circle is:
Area=πr
2
Taking π≈
7
22
:
Area=
7
22
×14×14
Area=22×2×14
Area=44×14=616sq cm
Radius (r)=
2
d
=
2
28
=14cm
The formula for the area of a circle is:
Area=πr
2
Taking π≈
7
22
:
Area=
7
22
×14×14
Area=22×2×14
Area=44×14=616sq cm