Question

The circumference of a circle is 12π units. How many units long is its radius? (Use only the digits 0 - 9 and the decimal point, if needed, to write the answer.)

Answer 1

Answer:

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Step-by-step explanation:

If

r

is the radius of a circle, then its circumference is

2

π

r

and area is

π

r

2

.

As circumference is given to be

12

π

, we have

2

π

r

=

12

π

or

r

=

12

π

2

π

=

6

c

m

.

As such radius is

6

c

m

and diameter being double of radius, diameter is

2

×

6

=

12

c

m

.

and area is

π

×

6

2

=

36

π

c

m

2

.