Circles
PSAT · Flashcards · Application
PSAT · FLASHCARDS
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QUESTION
Identify the radius of the circle
(
x
+
1
)
2
+
(
y
−
4
)
2
=
49
(x+1)^2+(y-4)^2=49
(
x
+
1
)
2
+
(
y
−
4
)
2
=
49
.
QUESTION
Find the distance between the centers of two circles with centers
(
1
,
2
)
(1,2)
(
1
,
2
)
and
(
4
,
6
)
(4,6)
(
4
,
6
)
.
QUESTION
Find the arc length when
r
=
6
r=6
r
=
6
and
θ
=
60
∘
\theta=60^\circ
θ
=
6
0
∘
.
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ANSWER
2
π
2\pi
2
π
.
s
=
60
360
⋅
2
π
(
6
)
=
1
6
⋅
12
π
=
2
π
s=\frac{60}{360}\cdot 2\pi(6)=\frac{1}{6}\cdot 12\pi=2\pi
s
=
360
60
⋅
2
π
(
6
)
=
6
1
⋅
12
π
=
2
π
.
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