Q1 AB is a line segment and P is its mid-point. Semicircles are drawn with AP, PB and AB as diameters on the same side of the line AB. A circle is drawn to touch all the three semi-circles. Find the radius of this circle.
(a) 1/4AB
(b) 1/6AB
(c) 1/7 AB
(d) 1/8AB
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