1. lines
and angles

2. Given:
ACB = 20°
DEF = 130°
Find:
CDE = __________ D F A E C B

3. vertical (opposite) angles have the same measure
Given:
ACB = 20°
DEF = 130°
Find:
CDE = __________ D F A
20° E
20° C B
vertical (opposite) angles
have the same measure

4. Given: ACB = 20° DEF = 130° Find: CDE = __________ D F A E C B 130°

5. supplementary angles have measures whose sum is 180°
Given:
ACB = 20°
DEF = 130°
Find:
CDE = __________ D F
130° A
20°
50° E C B
supplementary angles have
measures whose sum is 180°

6. the sum of the measures of the angles of a triangle is 180°
Given:
ACB = 20°
DEF = 130°
Find:
CDE = _110°______ D F A
20°
50° E C B
the sum of the measures of the
angles of a triangle is 180°

8. A C B D F E G I H

9.  A C B D F E G I H

10.  A C B
150° D F
150° E G
150° I H

11. A C
140°  B
150° D F
150° E G
150° I H

12. A C
140°
110°
40° B
30°
110
150° D F E G I H