class 8 math lesson 4 (geometry)
TRANSCRIPT
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11
1
04
A C D B
...
6
-.1(Extra-)12 , : , ABCD DO CO O , BO CO
AOCDB
, ABCD BC , , BO CO
ODCAB
, -
,,, BO CO ()
AODCB
9
() ()
EFDCBA3 , ABC D, E F AB, BC AC
() , () , DF BC
ABCD O , ,
() ? ?() ? ?
12 , 3 , ABC D, E F AB, BC AC
() , DF BC
EFDCBA() ,