Fig 20.26 shows a cross section of a iron rail.The top part consists of a rectangle and two semicircles at the ends.The bottom part of a trapezium.These two parts are joined by a rectangle in the middle.Find the area of the cross section. (Leave your answer in PI)
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Area of two semi circle= pie×r^2
=22/7×5×5
=78.5cm^2
Area of two rectangle= area r1+r2
=200+150=350cm^2
Area of tripazium =1/2 × sum of parallel sides
= 1/2 ×(40+30)
= 600cm^2
Total area 1028.5 cm^2
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