CBSE Class 10 Answered

remember that the arc length and the area of a sector both are connected with the angle that the arc/sector makes at the center.

length of the arc=(theta/180)*(pie *r)

where theta is the angle at the centre and r is the radius of the circle

pie=22/7.

Area of a sector=(theta/360)*(pie)*(r squared)

Remember that the length of the tangent segments drawn from an external point to a circle are equal in length.

Secant is a line which intersects the circle in two distinct points.

A tangent intersects the circle at one and only one point.

The radius thru' the point of contact is perpendicular to the tangent.

The point of contact is the point where the tangent meets the circle.