展览馆门前的圆形水池周长是78.5米,它的直径是多少米?半径是多少米?+L6d(]'q*k3A,p.O-|;C
解:
算式:提示:_,\1o4_5g(k+L6d(]'q*k3A,p.O-|;C
答:它的直径是,n7R3i6o,~2V-?:E4`米,半径是'j:t5|2?)s:b;N;`2J米。+L6d(]'q*k3A,p.O-|;C