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100 = 4s
s = 25 cm
L = s²
L= 25²
L = 625 cm²
100 = 4*s
s = 100:4
s = 25
L bangun belah ketupat adalah = d1*d2:2
= 25*25:2 (krn sisi belah ketupat sama)
= 625:2
= 312,5