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1

Point

A location in space represented by a dot, having no length, height, shape, or size, usually labelled with capital letters.

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2

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.

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3

Collinear Points

Three or more points lying on a single straight line.

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4

Non-Collinear Points

Points not lying on the same line.

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5

Coplanar Points

Points lying on the same plane.

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6

Non-Coplanar Points

Points not lying on the same plane.

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7

Horizontal Line

A line parallel to the x-axis in a plane, mapped from left to right or right to left.

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8

Vertical Line

A line parallel to the y-axis in a plane, mapped from up to down or down to up.

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9

Intersecting Lines

Lines crossing each other at a point.

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10

Perpendicular Lines

Lines intersecting at 90°.

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11

Parallel Lines

Lines not intersecting and equidistant.

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12

Polygon

A 2D shape with straight sides.

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13

Regular Polygon

Polygon with equal angles and sides.

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14

Irregular Polygon

Polygon with unequal angles and sides.

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15

Triangle

A polygon with 3 sides.

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16

Quadrilateral

A polygon with 4 sides, including squares, rectangles, trapezoids, and parallelograms.

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17

Interior Angles

Angles inside a polygon formed between two adjacent sides.

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18

Exterior Angles

Angles formed outside a polygon when a side is extended.

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19

Congruence

Triangles identical in size and shape with equal corresponding sides and angles.

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20

Pythagoras Theorem

In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.

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21

Circle Theorem 1

The angle between a tangent and a chord equals the angle subtended by the chord in the alternate segment.

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