老王围着边长为50米的正六边形的草地跑步，他从某个角点出发，跑了500米之后，与出发点相距有多远？

A .https://assets.asklib.com/psource/1473666592320077618.png B .https://assets.asklib.com/psource/1473666598503074272.png C .https://assets.asklib.com/psource/1473666626622095450.png D .https://assets.asklib.com/psource/1473666632319008210.png

A . 30 B . 25.52 C . 20.65 D . 24.23

A . 1：1 B . 3：4 C . 5：6 D . 9：11

A . 2a B . a C . (√3/2)a D . 12a

A .https://assets.asklib.com/psource/1471854120864071631.png B .https://assets.asklib.com/psource/1471854130428003899.png C . 50（https://assets.asklib.com/psource/1471854139435049311.png ）D .https://assets.asklib.com/psource/1471854160804097999.png