SABCD=2SABC=A2TANΑ2DO ĐÓVS.ABCD=SH.SABCD6 3 =A3TAN2Α.TANΒ

2 . - DAP AN DE ON TAP LAN 2 MATHVN
Lớp 12 DAP AN DE ON TAP LAN 2 MATHVN
2 .S

ABCD

=2S

ABC

=a

2

tanα2Do đóV

S.ABCD

=SH.S

ABCD

6 3 =a

3

tan

2

α.tanβ