Friday, July 5, 2013

Common Tangents - Unequal Radius

Draw the given circles with centres O and P and radii R1 and R2 respectively such that 
R1 > R2
  1. Draw a line segment joining centres O and P.
  2. With centre O and radius (R1 - R2 ) , draw a circle.
  3. From P , draw a tangent to the circle drawn in step 2.
  4. Draw a line through O and N to cut the outer circle at B.
  5. Through P , draw a line PD parallel to OB and cutting the circle with radius R2 at D.
  6. Draw a line joining B and D , which is the required tangent.
  7. Similarly , draw another external tangent through E and F.

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