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c² = a² + b²
c² = ( 18 : 2 )² + ( 24 : 2 )²
c² = 81 + 144
c² = 225
c = 15 cm
Keliling belah ketupat :
15 cm × 4 = 60 cm
lalu gunakan rumus phythagoras :
AB² = AO² + BO²
AB² = 12² + 9²
AB² = 144 + 81
AB² = 225
AB = √1225
AB = 15
jadi sisi belah ketupat adalah 15
keliling = 4s
= 4 x 15
= 60 cm