tianzhu:

lesskiasu:

Hi, can anyone help on to this question? The question is Catholic High Prelim 2011. http://i45.tinypic.com/2ryfq6o.jpg\">

Hi

Students are requested to leave their answers in terms of pi.

Apply the formula for calculating the area of a semi circle, and you should get an answer of 12.5pi.

Best wishes

Thanks Tianzhu for the answer. My dd couldn't figure out the working thus no answer for this.
Will get her do it next time to post the question together with the answer.
:thankyou:

Hi, can anyone help on to this question? The question is Catholic High Prelim 2011. http://i45.tinypic.com/2ryfq6o.jpg\">