Question

Tolong dijawab ya no 9.
besok udah dikumpul please^^

Answer 1

AC = 7
BD = 8
AD = 13

AC = AB  +  BC
  7  = AB + BC
AB = 7 - BC

BD = CD +  BC
  8  = CD + BC
CD = 8 - BC

AD = AB + BC + CD
13  = 7 - BC + BC + 8 - BC
13 = 7 + 8 - BC
13 - 15 = - BC
- 2 = - BC

BC = 2
AB = 7 - BC = 7 - 2 = 5
CD = 8 - BC = 8 - 2 = 6

BC : CD = 2 : 6
               = 1 : 3