s × 8 = 12 × 10
s × 8 = 120
s = 120/8
s = 15 cm
b. Perbandingan keliling trapesium (i) dan (ii)
= keliling trapesium (i) : keliling trapesium (ii)
= (12 + 8 + 18 + 10) : (27 + 12 + 18 + 15)
= 48 : 72
= 2 : 3
c. Perbandingan luas trapesium (i) dan (ii)