Home
About Us
Activities
Feedback
A.2 How do they differ?
Angles
Lines
r
and
s
are parallel. Alex finds the relationship between
∠
1 &
∠
5 and
∠
2 &
∠
6.
m
∠
1 = 120°
m
∠
6 = 60°
Alex's "Above the Line" Method
Because
∠
1
and
∠
2
are supplementary, I know that
180° -
120°
=
∠
2
.
Because
∠
5
and
∠
6
are supplementary, I know that
180° -
60°
=
∠
5
.
∠
1
and
∠
5
are both 120°,
∠
2
and
∠
6
are both 60°.
180° −
120°
=
60°
180° −
60°
=
120°
∠
1
≅
∠
5
∠
2
≅
∠
6
Backward
Forward