Question Detail
Question
In the construction of a common cross tangent to two equal circles (page 14), after bisecting O-O1 to get A and OA to get B, and drawing a semi-circle with radius OB from center B to cut the first circle at C, what is the crucial next step to locate the second tangent point D?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 14, step 5, states: 'Locate D on second circle with AC=AD.' This establishes the symmetry needed for the cross tangent.
Hint
Refer to 'To Construct a Common Cross Tangent to Two Equal Circles' on page 14, especially step 5.