Geometry, Teacher\'s Edition

TABLE1.8:(continued)

Example Angle Formula Segment Length
Angle formed by two in-
tersecting tangents

Difference of intercepted

arcs

N/A

Angle formed by two in-
tersecting secants

Difference of intercepted

arcs

a∗b=c∗d

whole secant 1 ∗ external

part 1 =whole secant 2 ∗ex-

ternal part 2

Angle formed by a tan-
gent and secant intersec-
tion

Difference of intercepted

arcs

b∗c=a^2

whole secant ∗ external

part=tangent^2

Chapter 1. Geometry TE - Teaching Tips