bantu dong mau dikumpul besok

luas trapesium = (a+b) × t / 2
a = 10
b = 20
t = 12

(10+20) × 12 / 2
30 × 6
180 cm2

L = 1/2 × (a+b) × t = 1/2 × (20+10) × 12 = 1/2 × 30 × 12 = 15×12 = 180cm persegi