CIRCLE RULES

Slide 1

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• isos ▵, = radii, base angles =

Slide 2

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• angle at center is 2x angle at circumf

Slide 3

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• angles on same arc are =

Slide 4

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• cyc quad, opp angles add to 180
• *cyclic quadrilateral has all 4 points touching the circumf

Slide 5

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• cyc quad, ext angle = int opp angle

Slide 6

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• tangent to radi = 90 degrees

Slide 7

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• = tgts
• (AT = BT)

Slide 8

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• isos ▵, = tgts

Slide 9

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• angle between tgt and chord = angle on chord in opp segment

Slide 10

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• angle in a semi-circle is 90 degrees