Mathematics · Geometry
Two circles with radii r1 and r2 respectively have their centers separated by a distance d. If the length of a direct common tangent is equal to the distance between the centers, which of the following is true?
- 1r1 = 2r2
- 2r1 = r2✓
- 3d = (r1 - r2)2
- 4d = r1 - r2
Correct answer
r1 = r2
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