17. Circles with radii 1, 2, and 3 are mutually externally tangent. What is the area of the triangle determined by the points of tangency? 3 (A) (B) (C) 1 (D) (E)

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A: Circle O with diameter AB, DA and CB are tangent segment  Prove: AD || CB

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Q: Where an Interior point Exists?

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Q: A circle of radius 3 centered at the origin.

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Q: Incentre of the triangle formed by common tangents of the circles x2 + y2- 6x = 0 and %3D x2 + y2 +…

A: Draw the figure:

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Q: A circle centered at (9, 15) has only 1 y-intercept. What is it's radius ?

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Q: Calculate 8-7 dz, z(4- z) where C is the circle of radius 7, centre 0, negatively oriented.

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Q: 2. Circles with fixed radius r and tangent to the y-axis.

A: Solution is given below:

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