Page 260 - ICSE Math 6

FUNDAMENTAL CONCEPTS OF GEOMETRY

Types of Boundary of Point
Closed Figures
A point is a mark of position represented by a dot.
Curvillinear Linear Collinear Points
A boundary having A boundary
only curved having only line Three or more points lying on the same line.
lines. segments.

Line
A collection of points along an endless straight path. Line Segment

Part of a line from one fixed point to the
Parallel Lines
other.
Lines which do not meet even when extended indefinitely.

Intersecting Lines
Two lines having a point in common.

Perpendicular Lines Ray
Two intersecting lines meeting at an angle of 90°.
Part of a line with a fixed end point and
moving endlessly in one direction.
Concurrent Lines
Three or more intersecting lines.

Open Figures Closed Figures
Having different beginning and end points. Having the same beginning and end points.

Incidence Properties

Only one line passes through two distinct points in a
plane.
Two different lines in a plane are either parallel or
intersect at exactly one point.

Interior of a Closed Curve Exterior of a Closed Curve
Set of all points lying inside Set of all points lying outside
the curve. the curve.

Boundary of a Closed Curve Region of a Closed Curve
Set of all points lying on the Set of all points lying inside
curve. and on the curve.

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