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L belah ketupat = 120
L = d1 . d2 . 1/2
120 = 24 . d2 . 1/2
120 . 2 = 24 . d2
240 = 24 . d2
d2 = 240 : 24
d2 = 10
24 : 2 = 12
10 : 2 = 5
sisi miring² = 12² + 5²
sisi miring² = 144 + 25
sisi miring² = 169
sisi miring =√169
sisi miring = 13
K = sisi miring . 4
= 13 . 4
= 52
d1 = 24
d2 = Lx2/d1 = 120 x 2 : 24 = 10
rusuk = √144 + 25 = 13
K = 13 x 4 = 52 cm