Question
The cross-section of a canal is trapezium in shape. The canal is 12 m wide at the top and 8 m wide at the bottom . If the area of the cross-section is 840 sq. m, the depth of the canal is :
Answer: Option D
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`1/2`(sum of parallel sides ) x depth = 1ts area
`hArr 1/2`(12 + 8) x d = 840
`hArr ` d = 84 m.
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