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Question
The shape of the cross section of a canal is a trapezium. If the canal is 10 m wide at the top, 6 m wide at the bottom and the area of its cross section is `640m^2` , find the depth of the canal.
Solution
Area of the trapezium=`1/2xx"(Sum of the parallel sides)"xx"(Distance between the parallel sides)"`
⇒`640=1/2xx(10+6)xxh`
⇒`1280/16=h`
⇒`h=80m`
Therefore, the depth of the canal is 80 m.
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