Page 3 - Lesson Note-1Introduction,Terms related to Circle Ch.- 10 Circle
P. 3
circles is 180 degrees.
Central Angle -The angle subtended at the centre of a circle by two given points on the
circle.
Congruent Arcs- Two arcs can be called congruent if they have the
same degree measure at centre.
Sector – A region bounded by two radii and an arc.
Segment- A region bounded by a chord and an arc lying between the chord’s
endpoints.
Concentric Circles Two or more circles that have different radii but the same center
are called as concentric circles.
Congruent Circles- If the radii of two circles are exactly the same then the circles are
called to be congruent circles.
Tangent- The line which touches the circle at a single point.
Secant-A line that intersects a curve or circle at two points
Segments of a Circle
A chord of a circle divides the circle into two regions, which are called the segments of
the circle.
Minor Segment- The region bounded by the chord and the minor arc intercepted by
the chord.
Major segment The region bounded by the chord and the major arc intercepted by the
chord.
