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alas=bd=10 cm
tinggi=ac-ab=22 cm- 12cm=10 cm
=10 cm X 10 cm=100 cm2 (pangkat dua)
=100 cm2 X 1/2=50 cm2(pangkat dua )
jd,luas layang-layang segita bcd adl 50 cm2(pangkat dua)