THIRD TANGENCY PRINCIPLE

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A BISECTOR can be defined as the line formed by

all the points that are centres of tangent circles of

two secant lines. 


The points of tangency are located by drawing

a perpendicular from the sceptre of the circle

to the given straight lines.



REMEMBER HOW TO DRAW A

PERPENDICULAR BISECTOR





THIRD TANGENCY PRINCIPLE

All cirumferences tangent to two secant lines

have their centres in the bisector

}}}}}}}}}}}}

r

s

bis.

C1

C2

Ts2

Ts1

Tr1

Tr2

r

s

V=C1

arc1

C2

arc 2

arc 3

C3

V

I