P is the centre of two concentric circles having radius 3 cm and 5 cm.

1.	P is the centre of two concentric circles having radius 3 cm and 5 cm. Two tangents are drawn from point A which is outside the circle. Tangent AM touches the smaller circle at point M and tangent AN touches the bigger circle at point N. If AM = 13 cm then AN = ?(1) √153 cm (2) √178 cm (3) √191cm (4) √161 cm
Answer» (2) √178 cm AP= √169 +9 = √178 AM= √178-25 =√153

P is the centre of two concentric circles having radius 3 cm and 5 cm. Two tangents are drawn from point A which is outside the circle. Tangent AM touches the smaller circle at point M and tangent AN touches the bigger circle at point N. If AM = 13 cm then AN = ?(1) √153 cm (2) √178 cm (3) √191cm (4) √161 cm

Answer»

(2) √178 cm

AP= √169 +9 = √178

AM= √178-25 =√153

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