A:①②③
B:①②④
C:①④
D:①③
A.一个多边形的每个内角都等于150°,则这个多边形是____边形.
B.用计算器计算:sin15°32'____(精确到0.01)
— Many kinds of animals are in danger now.
一 That's true. And the government is making laws to protect them.
a
b
c
d
e
如图,点A、B、C是直线l上的三个点,若AC=6、BC=2AB,则AB的长是( )