Pre-proof

1
Pre-proof
5/12/2016

• Why do we do the steps we do?
• Get your whiteboard ready!

2
b
d
a
c
If ?a 40, then ?b __ .
If ?c 100, then 100 ?d __ .
Reason
Reason
Definition of Supplementary
Vertical angles are congruent
3
H
E F
G
If F is the midpoint of EG, then EF ____.
I

J
X
Reason
Def. of midpoint
If XI bisects ?HXJ, then ?HXI ? ____.

Reason
Def. of bisector
4
r
k
s
m n
If r __ s, then ? k ___.
Reason
Def. of Perpendicular
If ?m 100, then ?n __.
Corresponding angles are congruent (when lines
are parallel)
Reason
5
P Q
If ?PSQ 20 and ?PSR 80, then 20 ?RSQ
80
R
S
Reason
Angle Addition Postulate
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Worksheet!