no 24 & 25!!!! pake caranya

1/4 lingkaran = 22/7 x 14 = 154
sisi miring segitiga = akar 12^2 + 5^2 = 13
20 + 7 + 13 + (20-7-5) = 48cm 
50.000 x 48 = 2.400.000

3/5 x 90 = 54
2/5 x 90 = 36
54-36 = 18