menghitung luas lingkaran
double phi = 3.14; double dimensi = 45; double jari2 = dimensi/2; double linkaran1 = phi * jari2^2; double linkaran2 = (1/4) * phi * dimensi^2;
double phi = 3.14; double dimensi = 45; double jari2 = dimensi/2; double linkaran1 = phi * jari2^2; double linkaran2 = (1/4) * phi * dimensi^2;