Circles
ACT · Flashcards · Application
ACT · FLASHCARDS
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QUESTION
What is the center of the circle
(
x
+
1
)
2
+
(
y
−
1
)
2
=
9
(x+1)^2 + (y-1)^2 = 9
(
x
+
1
)
2
+
(
y
−
1
)
2
=
9
?
QUESTION
State the radius of a circle with equation
x
2
+
y
2
=
81
x^2 + y^2 = 81
x
2
+
y
2
=
81
.
QUESTION
If the circumference is 31.4, estimate the radius.
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ANSWER
Radius
≈
5
\approx 5
≈
5
. Using
C
=
2
π
r
C = 2\pi r
C
=
2
π
r
, solve for
r
r
r
.
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