class 8 math lesson 02(geometry)
TRANSCRIPT
- 1. 1 1
- 2. 02
- 3.
- 4. c d b a D A EB F x C
- 5. ...
- 6. , : () () () () ()
- 7. a E D b : , a b A CB F a b a b -.(Extra-)
- 8. : (1) BE BC=a B BF BA=b (2) A C a b D (3) A D C D , ABCD - BCBF ABC a E D b A CB F a b a b
- 9. a E D : , a b A CB F a b b a
- 10. a b E DA CB F a b a : (1) BE BE BC=b BC B BF C a BF A A B b a A D C D , ABCD - ABC
- 11. 5 . .4 . .
- 12. 1. 6. . 4 . .
- 13.
- 14.