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20 . d2 / 2 = 480
20 . d2 = 480 . 2
20 d2 = 960
d2 = 960 : 20 = 48 cm
sisi belah ketupat
20 : 2 = 10 cm , 48 : 2 = 24
akar dari 10^2 + 24^2
= Akar dari 100 + 576
= Akar dari 676
= 26 cm
keliling = 4s
= 4 (26) = 104 Cm