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= 10 cm : 2
= 5 cm
b = d₂ : 2
= 24 cm : 2
= 12 cm
a² + b² = c²
5² + 12² = c²
25 + 144 = c²
169 = c²
√169 = √c²
13 = c
s = c
= 13 cm
K = s × 4
= 13 cm × 4
= 52 cm
Jadi keliling belah ketupat tersebut adalah 52 cm.
s² = 25 + 144
s² = 169
s = √169
s = 13 cm
Kelling = 4s = 4.13 = 52 cm