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如图.正六边形ABCDEF中.下列命题正确的是( )A.AC?AD=AD?ABB.AD=2
如图.正六边形ABCDEF中.下列命题正确的是( )A.AC?AD=AD?ABB.AD=2
发布时间:2021-02-20 14:17:20
(2010•泸州二模)如图,正六边形ABCDEF中,下列命题正确的是( )
A.
AC?
AD=
AD?
AB
B.
AD=2
AB+
AF
C.
AC+
AF=2
BC
D.(
AD?
AF)
EF=(
EF?
AF)
AD
网友回答
答案:
分析:
以A为原点,建立如图所示平面直角坐标系,设正六边形的边长为2,可得A、B、C、D、E、F各点的坐标.根据向量加减法的坐标运算法则和数量积的运算公式,对于各个选项的结论依次加以验证,可得A、B、D各项都不正确,只有C项正确.
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