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B-9.a The angle between the two tangents from the origin to the circle (x-7) (y1)25 equals42 |
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Answer» The distance between origin(0,0) and center of circle(7,-1) is √(7²+(-1)²) = 5√2.So, we can construct a circle of radius 5√2 and concentric to given circle. radius of given circle is 5 The newly constructed circle has radius is √2 times radius of given circle and concentric with given circle. So, the new circle is director circle of given circle. So, the angle between tangents must be π/2 |
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