明和强从圆形场地一地点出发,沿场地边相向而行,10分后相遇,明一分钟走72米强走85米,直径是多少米?

问题描述:

明和强从圆形场地一地点出发,沿场地边相向而行,10分后相遇,明一分钟走72米强走85米,直径是多少米?

(85-72)*10=3.14*d
d=41.4说清点,拜托了~~~~o(∩_∩)o....★~★