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TANGENTS

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TANGENTS

If a line is tangent to a circle, than the line is perpendicular to the radius

drawn to the point of tangency

•

O

h

A

If h tangent to circle than

Created by ﺠﻴﻄ for Mathlabsky.wordpress.com

Created by ﺠﻴﻄ for Mathlabsky.wordpress.com

Tangents to a circle from a point are congruent

Secant

A

A

P

●

O

Tangent

K ●

•

O

P

●

O

P

H ●

●

B

B

Common internal tangent

C

B

•

•

P

Q

A

C

P

Q

Common external tangent

A

AB = CQ

B

•

•

C

P

Q

C

Q

P