the cross section of a Canal is in the shape of a Trapezium the canal is 15 metre wide at the top of 9 metre wide at the bottom the area of cross section is 720 m square the depth of the canal is
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Area of trapezium=1/2(a+b)×h
Where A and B are parallel sides and H is the altitude or distance between A and B.
In a canal , the floor of canal and the top water surface are parallel . Height of trapezium is the depth of canal .
138 m =1/2(15+8)×height
Height=276/23=12 m
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Height
=276/23=12m................
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