find the circumference of a semicircular shape on a line of length 10cm
Answers
radius=0.05m
circumference=2π(Radius) =0.314m=31.4cm
Answer:
Step-by-step explanation:
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Okay, you will need to know these two formulas to solve:
A
=
π
r
2
and
C
=
2
π
r
,
where
A
is the area of the circle,
C
is the circumference (or perimeter), and
r
is the radius.
Also,
d
=
2
r
, where d is diameter.
Now, plug in
10
cm (the diameter) into this equation to find the radius of the given circle (as
d
).
d
=
2
r
(
10
)
=
2
r
r
=
5
cm
Now, you can use the radius that you found and the first two equations that I mentioned to find the area and perimeter of the circle.
A
=
π
r
2
A
=
π
(
5
cm
)
2
C
=
2
π
r
C
=
2
π
(
5
cm
)
Now, you can enter this into your calculator, where
π
is about
3.14
.
After doing so, you should get the two following numbers:
A
=
78.5
cm
2
C
=
30.9
cm
These are your two answers!
I hope that helped!