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Straight lines; Points- Point
- Collinear points
- Non-collinear points
- Line
- Parallel lines
- Perpendicular lines
- Skew lines
- Length
- Plane
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Polygons- Polygon
- Sides
- Vertex
- Diagonal
- Convex polygon
- Nonconvex polygon
- Regular polygon
- Triangle
- Square
- Rectangle
- Pentagon
- Hexagon
- Perimeter
- Area
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Circles and spheres- Radius
- Diameter
- Area
- Circumference
- Chord
- Tangent
- Sector
- Segment
- Semicircle
- Concentric circles
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Central and axial symmetry- Symmetry
- Plane
- Central symmetry
- Axial symmetry
- Translation
- Rotation
- Mirroring
- Axis
- Identical mapping
- Homothety
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Circles and spheres- Radius
- Diameter
- Area
- Circumference
- Chord
- Tangent
- Sector
- Segment
- Semicircle
- Concentric circles
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Number line and Cartesian coordinate system- Number lines
- Coordinates
- Axis
- Ordered pairs
- Cartesian coordinate system
- Quadrants
- Graph
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Central and axial symmetry- Symmetry
- Plane
- Central symmetry
- Axial symmetry
- Translation
- Rotation
- Mirroring
- Axis
- Identical mapping
- Homothety
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Fractions, percentages, proportions, data processing- Fractions
- Numerator
- Denominator
- Percentages
- Reciprocals
- Mixed fractions
- Proportions
- Decimals