Mathematics
NULL
Medium
Question
The cross-section of a canal is a trapezium. If the canal is 10 m wide at the top and 6 m wide at the bottom and the area of cross-section is 640 m², the depth of the canal is _________?
A
20 m
B
60 m
C
40 m
D
80 m
✓ Official correct answer
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A
20 m
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B
60 m
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C
40 m
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D
80 m
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Explanation
Area = (1/2)(10 + 6) × h = 640 ⇒ 8h = 640 ⇒ h = 80 m.