Q. 345.0( 1 Vote )

# To draw a pair of tangents to a circle, which is inclined to each other at an angle of 45°, we have to draw tangents at the end points of those two radii, the angle between which isA. 105°B. 135°C. 140°D. 145°

Let us consider a circle with center O and PA and PB are two tangents from point P, given that angle of inclination i.e. APB = 45°

As PA and PB are tangents to given circle,

We have,

OA PA and OB PB [Tangents drawn at a point on circle is perpendicular to the radius through point of contact]

So, OAP = OBP = 90°

By angle sum property of quadrilateral, we have

OAP + OBP + ABP + AOB = 360°

90° + 90° + 45° + AOB = 360°

AOB = 135°

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