Question:The cross section of 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 : 

A 42 m 
B 84 m 
C 63 m 
D 8.75 m 

+ Answer
B 

+ Explanation
`1/2 (12 + 8) xx d`

`= 840 or d = 84 m.`

+ Report

Irin Moni

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