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Point
A location in space represented by a dot, having no length, height, shape, or size, usually labelled with capital letters.
Line
A series of points connected by a straight path, defined by two points, marked with a single lowercase or two capital letters, having no thickness and infinite length.
Collinear Points
Three or more points lying on a single straight line.
Non-Collinear Points
Points not lying on the same line.
Coplanar Points
Points lying on the same plane.
Non-Coplanar Points
Points not lying on the same plane.
Horizontal Line
A line parallel to the x-axis in a plane, mapped from left to right or right to left.
Vertical Line
A line parallel to the y-axis in a plane, mapped from up to down or down to up.
Intersecting Lines
Lines crossing each other at a point.
Perpendicular Lines
Lines intersecting at 90°.
Parallel Lines
Lines not intersecting and equidistant.
Polygon
A 2D shape with straight sides.
Regular Polygon
Polygon with equal angles and sides.
Irregular Polygon
Polygon with unequal angles and sides.
Triangle
A polygon with 3 sides.
Quadrilateral
A polygon with 4 sides, including squares, rectangles, trapezoids, and parallelograms.
Interior Angles
Angles inside a polygon formed between two adjacent sides.
Exterior Angles
Angles formed outside a polygon when a side is extended.
Congruence
Triangles identical in size and shape with equal corresponding sides and angles.
Pythagoras Theorem
In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.
Circle Theorem 1
The angle between a tangent and a chord equals the angle subtended by the chord in the alternate segment.
Note 
Flashcard (102)