Question

3. The cross-section of a canal is a trapezium in shape. If the canal is 10 m wide at the top 6 m wide
at the bottom and the area of cross-section is 72m determine its depth.​

Answer 1

Answer:

9

Step-by-step explanation:

Area of trapezium=1/2(a+b)h

72=1/2(10+6)h

72=1/2(16)h

72=8h

h=72/8

h=9

Answer 2

Answer:

Given :- a=12m , b=8m , height =h and area of trapezium =84m  

2

 

So, putting the respective values , we get,

area of trapezium =  

2

1

​  

×(a+b)×h

= 84=  

2

1

​  

×(8+12)×h

= 84=  

2

20h

​  

 

= 84=10h

= h=  

10

84

​  

 

= h=8.4m