Question

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Answer 1

so the right answer is of option D.

Look at the attached picture⤴

hope this will help u....

Answer 2

Ok o the formula for the area of a FULL circle is Pi multiplied by radius squared
But, in his case w have half a circle so we would change our formula to Pi multiplied by radius squared DIVIDED BY TWO
so, we do pi*20^2/2
So, in terms of Pi, our answer is 200 Pi which is option d