CIRCLE RULES

Diapositiva 1

• 
• isos ▵, = radii, base angles =

Diapositiva 2

• 
• angle at center is 2x angle at circumf

Diapositiva 3

• 
• angles on same arc are =

Diapositiva 4

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

Diapositiva 5

• 
• cyc quad, ext angle = int opp angle

Diapositiva 6

• 
• tangent to radi = 90 degrees

Diapositiva 7

• 
• = tgts
• (AT = BT)

Diapositiva 8

• 
• isos ▵, = tgts

Diapositiva 9

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

Diapositiva 10

• 
• angle in a semi-circle is 90 degrees