Question Detail
Question
To construct a common tangent to two unequal circles (Page 15) with radii R and r (R > r), what specific radius is used to draw a circle from the center of the larger circle (O) to cut the semi-circle?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Page 15, step 4 for 'To Construct a Common Tangent to Two UNEqual Circles' instructs: 'Draw a circle centre O with radius R-r to cut semi-circle at B.'
Hint
For a *common direct* tangent to unequal circles, the difference in radii is often used.