bantu jawab ya pakai jalan

4)K1 = 1/2 π d = 1/2 x 22/7 x28= 44cm
K2= 4 x sisi= 4 x 28 = 112 cm
K1 + K2 =44 + 112 = 156 cm

5)L1 = 1/2 (a+b )t
= 1/2x (13+21)x 3
= 51cm²
L2= p x l
= 21 x 5 = 105cm²
L1 + L2 =51 + 105 =156cm²