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I_1 can be be interpreted as area of two triangles;one above the x-axis and the other below axis.Since they are on the opposite sides of x-axis so the net resultant area will be zero.(see attached graph)
I_2 can be interpreted as the top half of a circle with centre the origin and radius 5 and above the x-axis from x=-5 to x=5.
Area of semi circle=`pi(5^2)/2=(25pi)/2`
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