void setup() { double a = 10.0; //上底の長さ double b = 20.0; //下底の長さ double c = 15.0; //高さ println("上底 = " + a); println("下底 = " + b); println("高さ = " + c); println("面積 = " + areaTrapezoid(a,b,c)); } double areaTrapezoid(double bUpper, // length of upper base double bLower, // lenght of lower base double h // height ) { return (bUpper + bLower)*h/2; }