圆形喷水池的周长是78.5米,它的半径是多少米?

问题描述:

圆形喷水池的周长是78.5米,它的半径是多少米?

78.5÷(3.14×2),
=78.5÷6.28,
=12.5(米);
答:它的半径是12.5米.