1. A tangent PQ at a point P of a circle of radius 5cm meets a line through the centre O at a Q so that OQ = 13cm. Find the length PQ. 2.From a point Q, the length of the tangent to a circle is 24cm and the distance of Q from the centre is 25cm.,find the radius of the circle. 3.OD is perpendicular to the chord AB ofthe circle whose center is O.If BC is diameter,find CA/OD=?
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1. 12 cm
2. 7 cm
3. 2/1 is the value of CA/OD as; OC=OB [radius of circle]
DA=DB [radius is perpendicular bisector of
chord if coming straight;concept of
class 9.]
so, o is centre of CB and D is centre of AB therefore OD is parallel to CA [by mid point theorm] then the ratio btw them ie.,CA/OD= 2/1...... OR...... CA:OD=2:1 BY, mid point theorm
2. 7 cm
3. 2/1 is the value of CA/OD as; OC=OB [radius of circle]
DA=DB [radius is perpendicular bisector of
chord if coming straight;concept of
class 9.]
so, o is centre of CB and D is centre of AB therefore OD is parallel to CA [by mid point theorm] then the ratio btw them ie.,CA/OD= 2/1...... OR...... CA:OD=2:1 BY, mid point theorm
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