Apply Circle Area and Circumference Formulas
Middle School Math · Flashcards · Application
MIDDLE SCHOOL MATH · FLASHCARDS
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QUESTION
Identify the incorrect step:
C
=
2
π
r
C=2\pi r
C
=
2
π
r
,
r
=
4
r=4
r
=
4
, so
C
=
2
π
(
4
)
=
8
π
2
C=2\pi(4)=8\pi^2
C
=
2
π
(
4
)
=
8
π
2
. What is the correct
C
C
C
?
QUESTION
Find the area when
d
=
10
d=10
d
=
10
and leave the answer in terms of
π
\pi
π
.
QUESTION
Identify the correct expression for area if a circle has radius
r
=
5
r=5
r
=
5
.
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ANSWER
A
=
25
π
A=25\pi
A
=
25
π
. Use
A
=
π
r
2
A=\pi r^2
A
=
π
r
2
with
r
=
5
r=5
r
=
5
:
A
=
π
(
5
)
2
=
25
π
A=\pi(5)^2=25\pi
A
=
π
(
5
)
2
=
25
π
.
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