1. Given: ABL BC;
21 and 23 are
complementary.
Prove: 42 = 23
Proof:
Statements
a. AB 1 BC
b.
c. m/ABC = 90
d. m/ABC:
m21+ m22
e. 90 m/1 +
=
m22
f. 21 and 22 are
compl.
g.
h. 22 23
B
Reasons
W/N
E
f.
D
a.
Given
b. Definition of 1
C
c. Def. of right angle
d.
color
e. Substitution
g. Given
1. Subst prop