Math Circle Formulas

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10 Terms

1
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2 intersecting chords

(ab)=(cd)

<p>(ab)=(cd)</p>
2
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perpendicular chord to diameter

(ab)=x²

<p>(ab)=x²</p>
3
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two tangents are

congruent

<p>congruent</p>
4
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2 secants

(whole)(outer)=(whole)(outer)

<p>(whole)(outer)=(whole)(outer)</p>
5
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1 secant and 1 tangent

(whole)(outer)=x²

<p>(whole)(outer)=x²</p>
6
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central angle

equal to the intercepted arc

<p>equal to the intercepted arc</p>
7
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inscribed angle

half of the intercepted arc

<p>half of the intercepted arc</p>
8
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outside angle formed by 2 secants

(bigger arc-smaller arc)/2

<p>(bigger arc-smaller arc)/2</p>
9
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outside angle formed by a decant and tangent

(bigger arc-smaller arc)/2

<p>(bigger arc-smaller arc)/2</p>
10
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inside angle

(intercepted arc+other intercepted arc)/2

<p>(intercepted arc+other intercepted arc)/2</p>

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