A straight line meets the co-ordinate axes at A and B. A circle is circumscribed about the triangle OAB, O being the origin. If m and n are the distances of the tangent to the circle at the origin from the points A and B respectively, the diameter of the circle is
- Am(m + n)
- Bm + n
- Cn(m + n)
- D$${1 \over 2}$$(m + n)
✓ Correct answer: B
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