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144 + 81 = 255
√255 = 15
Panjang setiap sisi Belah ketupat itu ialah 15 cm
maka keliling dari belah ketupat itu 15 x 4 = 60
18:2=9
√12^2 + 9^2
=√144+81
=√225
=15
panjang sisi 15