Dear student,
I wont solve your question directly but give you one hint. Please follow this example
Question:   A field is in the shape of a trapezium whose  parallel sides are 25 m and 10 m. The non-parallel sides are 14 m and 13  m. Find the area of the field.
 
 
 
 

Answer:   
 Let us draw BE || AD
 
 Then ABED is a parallelogram BE = 13 m DE = 10 m EC = 15 m
 
 For BEC,
 
 
 
 
 
 
 
 
 
 
 
 
 Height of trapezium = 11.2 m
 
 Area of field
 
 
= 196 m2
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Askiitians Expert
Sagar Singh
B.Tech, IIT Delhi
						

							
Find the area of a trapezium whose two parallel sides are 3 m and 4 m and 2 dm respectively. Each of the other sides of the trapezium is 2 m.
						

							The answer is 6√51 square centimetres.Same way as example provided above. In cases other than this, the area of a trapezium is calculated in another way