Question Detail
Question
To construct an external tangential curve of radius R to two given circles of radii r1 and r2 (Page 20), what radii are used for the arcs drawn from the centers A and B of the given circles to find the center O of the tangential curve?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Page 20, steps 2 and 3 for 'To Construct a Curve Tangential to Two Circles' (external case) state: 'With centre A and radius R+r1, draw an arc' and 'With centre B and radius R+r2, draw an arc to intersect the first arc at O.'
Hint
For external tangency, the distance between centers is usually the sum of radii.