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A point determines a location. It is usuallydenoted by a capital letter.
A line segmentcorresponds to the shortest distancebetween two points.The line
Two distinct lines meeting at a point are called intersecting lines. Two lines in a plane are said to be parallel if they do not meet.
A ray is a portionof line startingat a point and goingin one direction endlessly.
Any drawing (straight or non-straight) done without liftingthe pencil may be calleda curve. In this sense,a line is also a curve.
A simple curve is one that does not cross itself.
A curve is said to be closed if its ends are joined;otherwise it is said to be open.A polygon is a simpleclosed curve made up of line segments.Here,
(i) The line segmentsare the sides of the polygon.
(ii) Any two sides with a common end point are adjacent sides.
(iii) The meeting point of a pair of sides is called a vertex.
(iv) The end pointsof the same side are adjacent vertices.
(v) The join of any two non-adjacent verticesis a diagonal.
An angle is made up of two rays startingfrom a common end point.
An angle leadsto three divisions of a region:
On the angle, the interior of the angle and the exterior of the angle. A triangle is a three-sided polygon.
A quadrilateral is a four-sided polygon. (It shouldbe named cyclically). In any
similarrelations exist for other threeangles.
A circle is the path of a point moving at the same distance from a fixed point. The fixed point is the Centre,the fixed distanceis the radius and the distancearound the circleis the circumference.
A chord of a circle is a line segment joining any two points on the circle. A diameter is a chord passing throughthe Centre of the circle.
A sectoris the region in the interior of a circleenclosed by an arc on one side and a pair of radii on the othertwo sides.
A segmentof a circle is a region in the interiorof the circle enclosed by an arc and a chord.
The diameter of a circledivides it into two semi-circles.
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