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trapesium = ½(a+b)t
layang layang = ½(d1 × d2)
LUAS=S X S
TRAPESIUM=LUAS=1/2(A+B) X T
=AB+BC+CD+DA
LAYANG-LAYANG=LUAS=1/2XD1XD2
=2.S1+2.S2