Circles Class 10 Notes Maths: Chapter 10

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    Basic Concepts-01

    Circles

    1. tangent to a circle is a line that touches the circle at only one point. There is only one tangent at a point on a circle.
    2. From a point lying outside a circle, two and only two tangents can be drawn to it.
    3. The lengths of the two tangents drawn from an external point to a circle are equal.
    4. A tangent to a circle is perpendicular to the radius through the point of contact.
    5. A line whichintersects a circle at two distinct points is called secant of the circle.
    6. Alternative Segment Theorem : If a chord is drawn through the point of contact of a tangent to a circle, then the angles made by the chord with the tangent are respectively equal to the angles subtended by the chord in the alternate segments.