30. A field is in the shape of a trapezium having parallel sides 90 m and
30 m. These sides meet the third side at right angles. The length of the
fourth side is 100 m. If it costs 5 to plough 1 m of the field, find the
total cost of ploughing the field.
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7
Answer:
Rs 30,000
Step-by-step explanation:
first draw a trapezium whose parallel sides are 90 and 30m
and name the trapezium ABCD. Draw two perpendicular on A and B.
Now we have two triangles and one rectangle.
The area of the triangle = 1/2* b*h
1/2*30*100=1500
The area of second triangle =1500*2=3000
Area of rectangale= l*b
100*30=3000
So the total area of the trapezium =3000+3000=6000
So total cost of ploughing the field =6000*5=30000.
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