The area of a circle is 616 sq cm, find its circumference?
- A44 cm
- B88 cm
- C22 cm
- D176 cm
Solution & Step-by-step Explanation
The formula for the area of a circle is:
Area=πr
2
Given, Area=616 cm
2
:
7
22
×r
2
=616
r
2
=
22
616×7
r
2
=28×7=196
r=
196
=14 cm
Now, find the circumference using the formula:
Circumference=2πr
Circumference=2×
7
22
×14=2×22×2=88 cm
Area=πr
2
Given, Area=616 cm
2
:
7
22
×r
2
=616
r
2
=
22
616×7
r
2
=28×7=196
r=
196
=14 cm
Now, find the circumference using the formula:
Circumference=2πr
Circumference=2×
7
22
×14=2×22×2=88 cm