1.Radius is
6
c
m
, circumference is
12
π
cm.
Explanation:
The diameter of a circle is two times the radius, or,
d
=
2
r
This means that the radius is one half of the diameter,
1
So, if
cm,
(
)
The circumference is given by
. We know
,
so
cm
2.4
the diameter is 4 cm which means the radius is 2 cm. Diameter divided by two will give you the radius. The formulae for circumference is 2
⋅
. So the circumference would be 4
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Answers & Comments
1.Radius is
6
c
m
, circumference is
12
π
cm.
Explanation:
The diameter of a circle is two times the radius, or,
d
=
2
r
This means that the radius is one half of the diameter,
r
=
1
2
d
So, if
d
=
12
cm,
r
=
1
2
(
12
)
=
12
2
=
6
cm.
The circumference is given by
c
=
2
π
r
. We know
r
=
6
,
so
c
=
2
π
(
6
)
=
12
π
cm
2.4
π
Explanation:
the diameter is 4 cm which means the radius is 2 cm. Diameter divided by two will give you the radius. The formulae for circumference is 2
π
⋅
r
. So the circumference would be 4
π
56.52
c
m
Explanation:
The formula for the circumference of a circle is
=
2
π
r
The radius
=
9
c
m
circumference
=
2
π
r
=
2
×
3.14
×
9
=
6.28
×
9
=
56.52
c
m
=
43.98
c
m
Explanation:
The circumference of a circle can be calculated with the formula:
C
=
2
π
r
where:
C
=
circumference
r
=
radius
To find the circumference, substitute your known values into the equation:
C
=
2
π
r
C
=
2
π
(
7
)
C
=
14
π
C
≈
43.98
∴
, the circumference is approximately
43.98
c
m
.