1. jajar genjang a = 15 cm t = 10 cm Keliling? 2. Layang-layang D¹ = 18 cm D² = 10 cm Keliling?

JAJAR GENJANG
Keliling = Jumlah seluruh sisi
K = 2.alas + 2.sisi miring
K = 2.alas + 2.tinggi
K = 2.15 + 2.10
K = 30 + 20 = 50 cm

1. k =2 × ( a + t )
       = 2 × ( 15 + 10 )
       = 2 × ( 25 )
       = 50
2. k= 2× (d1 + d2)
     = 2 × ( 18+10)
     = 2 × (28)
     =56