: 翴㎝秖 肈: 钡块 玡: 钡块   ヘ魁   ま

计㎝à

计㎝àノ计翴才腹ㄓボ "." 

计 r

r = 5.32

à(^o) ┪┓ (rad)ㄓボ盽计 pi 盽ノ┓

		┓
à alpha	alpha = 60o	alpha = pi / 3

GeoGebra 常ノ┓ㄓず场笲衡 才腹 " ^o " 琌ノㄓ锣传计㎝┓盽计 ${\frac{{\pi}}{{180}}}$ 