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S1-Geometry terms

An introduction to basic geometric terms for Sec 1 students

TermDescription
Point It represents a position. It has no size.
Line It is made up of countless or infinite number of points. It can be straight or curved and is extensible in opposite directions.
Line segment It is part of a straight line with a starting point and an ending point. It has length.
Ray It starts from a point and extends outwardly in one direction
Intersecting Meeting or cutting across.
Plane Is a flat surface without any thickness.
Collinear Is used to describe three or more points which lie on the same straight line.
Acute angle An angle which is less than 90° .
Right angle An angle which is 90° .
Obtuse angle An angle which is more than 90° but less than 180°.
Straight angle An angle which is 180°
Reflex angle An angle which is more than 180° but less than 360°.
Perpendicular Is used to describe two lines which intersect at 90°.
Supplementary angles Are two angles which add up to 180°.
Adjacent angles Are two angles which have a common side and a common vertex.
Vertex Is a pointed corner.
Parallel lines Are lines that do not meet.
Transversal Is a line which cuts two or more lines on the same plane.
Created by: edugan_hoh
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