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54 = 1/2 . 4a . 3a
108 = 12a²
a = 3
panjang diagonalnya:
d1 = 4a = 12
d2 = 3a = 9
Sisi belah ketupat:
s = √6² + 4,5² = √36 + 20,25 = √56,25 = 7,5
Jadi, panjang sisi belah ketupat 7,5 cm
12x² = 108
x² = 108/12
x² = 9
x = √9 = 3
s² = (1/2×12)² + (1/2×9)²
= 6² + 4,5²
= 36 + 20,25
= 56,25
s = √56,25
= 7,5 cm