Question

把一个圆的面积按2:7剪成两个扇形,大扇形比小扇形面积多15平方厘米,小扇形面积是多少?

Answer 1

(15/(7/(7+2)-2/(7+2)))*(2/(7+2))

=(15/(7/9-2/9))*(2/9)

=(15/(5/9))*(2/9)

=(15*(9/5))*(2/9)

=27*(2/9)

=6平方厘米

小扇形面积是6平方厘米.