tolong nomer 2 ya pakai cara

Keliling = 52 cm 
sisi miring trapesium = 52 ÷ 4 =13 cm
AB = 2x + 3
AB :
2x + 3 = 13
2x = 10
x = 5cm

BD = 2x = 2 × 5 = 10cm
AC = 4x + 4 = 4×5 + 4 = 24cm

Luas belah ketupat :
d1 x d2 / 2
= 10 × 24 / 2
= 120cm²