Unit 9: Circles Equations

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11 Terms

1
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Vertex’s is ON the circle

X = ½ y

2
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Vertex IN circle (not a central angle)

(y+w)/2 = x

3
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vertex OUTSIDE circle

(w-y)/2 = y

4
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<p>chord chord power theorem</p>

chord chord power theorem

ab * bc = eb * bd

ab/bd = eb/bc

<p>ab * bc = eb * bd</p><p>ab/bd = eb/bc</p>
5
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<p>Secant Secant Power theorem</p>

Secant Secant Power theorem

ac * ab = ad * ae

ac/ae = ad/ab

<p>ac * ab = ad * ae</p><p>ac/ae = ad/ab</p>
6
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<p>Tangent Secant power theorem</p>

Tangent Secant power theorem

(ad)² = ab * ac

<p>(ad)² = ab * ac</p>
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1 radian = ? degrees

180/pi

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1 degree = ? radians

pi/180 radians

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How many radians in a circle (360 = ? radians)

2pi(radians)

10
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<p>if x is in degrees, what is S?</p>

if x is in degrees, what is S?

S = pi[r]•x/180

<p>S = pi[r]•x/180</p>
11
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<p>If x is in radians, what is S?</p>

If x is in radians, what is S?

S = r•x

<p>S = r•x</p>