Circles
ACT Math · Flashcards
ACT MATH · FLASHCARDS
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QUESTION
What is the relationship between a radius and a tangent line at the point of tangency?
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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