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Dik:L=240 cm²
d1=30 cm
d2=_____?
penyelesaian:
L=½×d1×d2
240=½×30×d2
240=15×d2
d2=240/15
d2=16 cm
jadi,panjang sisi belah ketupat (d2) nya adalah 16 cm
semoga membantu:3
semangat ya belajar nya:3