Question Detail
Question
For constructing a common cross tangent to two unequal circles with radii R (larger) and r (smaller), what is the effective radius used to draw a circle from the center of the larger circle to cut a semi-circle, as outlined on page 16?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Page 16, step 4, states: 'Draw a circle centre O with radius (R+r) to cut semi-circle at B.' This sum of radii is used for the construction of a cross tangent between unequal circles.
Hint
Review 'To Construct a Cross Tangent to Two UNEqual Circles' on page 16, focusing on step 4 and the diagram.