The mean length of the bases of a trapezium is 105 cm.find the area of the trapezium if its altitude is 80 cm.
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the mean lenght of bases of trapezium i.e(a+b/2)=105cm
height of trapezium (h)=80 cm
now ,
the area of trapezium=(a+b/2)*h
=105*80
=8400cm sq
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