Radian Measure and Arc Length
Precalculus · Flashcards · Application
PRECALCULUS · FLASHCARDS
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QUESTION
Find the arc length
s
s
s
when
r
=
5
r=5
r
=
5
and
θ
=
3
π
2
\theta=\frac{3\pi}{2}
θ
=
2
3
π
(radians).
QUESTION
Find the central angle
θ
\theta
θ
in radians when arc length
s
=
12
s=12
s
=
12
and radius
r
=
3
r=3
r
=
3
.
QUESTION
Find the radius
r
r
r
when arc length
s
=
10
π
s=10\pi
s
=
10
π
and
θ
=
5
π
2
\theta=\frac{5\pi}{2}
θ
=
2
5
π
(radians).
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ANSWER
4
4
4
. Use
r
=
s
θ
r=\frac{s}{\theta}
r
=
θ
s
:
r
=
10
π
5
π
2
=
4
r=\frac{10\pi}{\frac{5\pi}{2}}=4
r
=
2
5
π
10
π
=
4
.
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