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Sisi b = 16 cm : 2 = 8 cm
Sisi c :
c = √ ( a² + b² )
c = √ ( 6² + 8² )
c = √ ( 36 + 64 )
c = √100
c = 10 cm
Keliling belah ketupat :
10 cm × 4 = 40 cm