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= 100:4= 25cm.
panjang AC
= 25²= 20²+d2
= 625= 400+d2
d2
=√625-400
=√225
=15 cm.
luas belah ketupat adalah:
d1.d2:2
=40.30:2
=1200:2
=600 cm²
sisi = 100 : 4 = 25 cm
d1 = 40
d2 = 30 cm
luas = d1 x d2 / 2
= 40 x 30 / 2
= 600 cm persegi