Circles
ACT · Flashcards · Recall
ACT · FLASHCARDS
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QUESTION
State the circumference formula for a circle with radius
r
r
r
.
QUESTION
State the equation of a circle centered at the origin with radius
r
r
r
.
QUESTION
What is the relationship between a radius and a tangent line at the point of tangency?
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ANSWER
They are perpendicular. Forms a
90
°
90°
90°
angle at point of contact.
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