1.
1. given
2.
2. given
3.
3. all right angles are
4. AB = CD
4. definition of
5. AB + BC = CD + BC
5. addition property
6. AB + BC = AC
CD + BC = BD
6. segment addition postulate
7. AC = BD
7. substitution property
8.
8. definition of
9. ♣
9. ♦
10.
10. CPCTC