tolong dijawab pertanyaan

2. a) AB = BC = CD = AD
= akar 12 kuadrat + 9 kuadrat
= akar 144 + 81
= akar 225
= 15 cm
b) Kll = 4 × 15
= 60 cm
3. L = d1 × d2 ÷ 2
150 × 2 = 15 × (3x + 2)
300 = 45x + 30
270 = 45x
6 = x
jadi, nilai x = 6