#13公式計算，比方寫梯形面積的 function

Target: 在playground建立Function與型別

寫出梯形面積計算function解出下面三題梯形面積

func trapezoidArea(topline: Double, baseline: Double, height: Double) {
    let Area = (topline + baseline) * height / 2
    print(Area)
}
trapezoidArea(topline: 4, baseline: 6, height: 5)
trapezoidArea(topline: 3, baseline: 5, height: 2)
trapezoidArea(topline: 3, baseline: 7, height: 4)

答案正確