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January 30, 2015

January 30, 2015

Posted by **Stranger** on Tuesday, March 19, 2013 at 1:46am.

- Maths -
**Steve**, Tuesday, March 19, 2013 at 11:15amHmm. Place point D such that ABCD is a rectangle.

Let the center of the semi-circle be at point O on AC.

Draw another semi-circle centered at O, to form a complete circle. Since it is tangent to AB, it is also tangent to DC.

So, the diameter of the circle is 7, and the radius is 7/2, so a+b=9.

- Maths -
**student**, Saturday, March 23, 2013 at 12:59pmits wrong steve

- Maths -
**Kishan**, Sunday, March 24, 2013 at 1:53am199

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