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d2 = 12x
1/2 X d1 X d2 = luas belah ketupat
1/2 X 5x X 12x = 120
1/2 X 60x = 120
60x = 120:2
60x = 240
x = 4
d1=5x4 =20
d2=12x4 = 48
keliling belah ketupat
= 4 x sisi
= 4 x √10² + 24²
= 4 x √100+576
= 4 x √676
= 4 x 26
= 104 cm