13 4.2 = = − = + ( )11 T6 3 3GÓC CẦN QUÉT
4 .
13
4.2
=
=
− =
+
( )
1
1
t
6
3
3
Góc cần quét:
23 13
2
( )
=
−
=
−
=
+
t
t
4
3.2
2
1
6
6
=
3
4 .
13
4.2
=
=
− =
+
( )
1
1
t
6
3
3
Góc cần quét:
23 13
2
=
−
=
−
=
+
t
t
4
3.2
2
1
6
6
=
3