1. Thales Theorem :
2. Converse of Thales Theorem :
3. Midpoint Theorem :
4. Angle Bisector Theorem :
5. If two triangles similarity then :
6. A – A – A Similarity :
7. A – A Similarity :
8. S – A – S Similarity :
9. S – S – S similarity :
10. If two triangle similarity then
11. If AL and DM are medians of ΔABC and ΔDEF then
12. If AL and DM are bisectors of angle A and angle D then
13. If ΔABC ∼ ΔDEF then
14. If ΔABC ∼ ΔDEF then
15. If ΔABC ∼ ΔDEF , AL ⊥ BC and DM ⊥ EF then
16. If ΔABC ∼ ΔDEF , AL and DM are medians of ΔABC and ΔDEF respectively then –
17. If ΔABC ∼ ΔDEF , AL and DM are bisevtors of angle A and angle D respectively then –
18. Pythagoras Theorem :
19. Converse of Pythagoras Theorem :
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