The cross-section of a cannel is a trapezium in shape. If the cannel is 12 m wide at the top and 8 m wide at the bottom and the area of cross-section is 690 sq m, the depth of cannel is? Choose the correct answer: A) 39 B) 28 C) 27 D) 69 E) 71
1/2 * d (12 + 8) = 690   d = 69   Answer: 69
<result>D</result>
The cross-section of a cannel is a trapezium in shape. If the cannel is 12 m wide at the top and 8 m wide at the bottom and the area of cross-section is 690 sq m, the depth of cannel is?