The cross-section of a canal is trapezium in shape. If the canal is 10 metres wide at the top and
6 metres wide at the bottom and the area of cross section is 640 sq. metres. Find the length of canal.
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Answer:
.Area = h(I+b)/2 = 640
h (lo+6)/2 = 640
hx8=640
h = 640/8=80 meter
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