Jawabanmu

2014-03-30T11:45:31+07:00
L belah ketupat = (d1 x d2) / 2 = (x cm . y cm) /2 = xy / 2 cm
2014-03-30T12:23:47+07:00
L = 1/2 x d1 x d2. = 1/2 x x cm x y cm. = 1/2 xy cm2. Atau xy/2 cm2