Geometry

1. Symmetry

1.1. Line Symmetry, it occurs when one half of the image is a mirror of another half

1.2. Reflective Symmetry, when it looks the same on the other side of the line.

2. 3D Shapes

2.1. Cone

2.2. Cylinder

2.3. Cube

2.4. Pyramid

2.5. Rectangular Prism

2.6. Sphere

3. 2D Shapes

3.1. Square

3.2. Rectangle

3.3. Circle

3.4. Triangle

4. Perimeter

4.1. The measurement around the edges of a shape.

5. Area

5.1. The measurement of the amount of space inside the boundaries of an object

6. Symmetry

7. Polygons

7.1. Hexagon (A shape with 5 sides)

7.2. Pentagon (A shape with 6 sides)

7.3. Octagon (A shape with 8 sides)

7.4. Quadrilateral (A shape with 4 sides)

7.5. Heptagon (A shape with 7 sides)

7.6. Nonagon (A shape with 9 sides)

7.7. Irregular Polygons: (n-2)x180°

8. Lines Terminology

8.1. Line (A B)

8.2. Line segment

8.3. Concurrent Lines

8.4. Collinear points

8.5. Perpendicular lines

8.6. Parallel lines

8.7. Transversal

9. Geometry Theorems

9.1. Angles at a point

9.2. Adjacent angles on a straight line

9.3. Adjacent angles in a right angle

9.4. Vertically opposite angles

9.5. Corresponding angles

9.6. Alternate angles

9.7. Co-interior angles

9.8. Angles of a triangle

9.9. Exterior angle of a triangle

9.10. Angles of a quadrilateral

10. Shape

10.1. Triangle

10.2. Solid (3D)

10.3. Plane (2D)

10.4. Line

11. Angles

11.1. Full Rotation 360°

11.2. Straight 180°

11.3. Right 90°

11.4. Acute (less than 90°)

11.5. Obtuse (90°-180°)

11.6. Reflex (Greater than 180°)