C-08-Q179mediumsingle_mcq
The proof of Theorem 27 uses the fact that at the point of contact—
The proof of Theorem 27 uses the fact that at the point of contact—
- athe tangent is the common diameter
- beach radius is perpendicular to the common tangent
- cthe radii coincide
- dthe tangent equals zero
ব্যাখ্যা
At the point of contact the two circles share a common tangent, and each circle's radius to that point is perpendicular to it. Since both radii are perpendicular to the same line at the same point, they lie along one straight line.