tolong dijawab besok mau dikumpul please

a) L.PQS = a × t × 1/2 = 9 × 18 × 1/2 = 81 cm^2
b) L.SQR = a × t × 1/2 = 18 × 6 × 1/2 = 54 cm^2
c) L.PQRS = L.PQS + L.SQR = 81 + 54 = 135 cm^2