Geometry

2. Both angles add up to 180o and are on the same side of the transversal. Both angles are also between the parallel lines.
5. - Two lines in the same plane, an equal distance apart which never intersect.
7. Both angles are equal and on different sides of the transversal. Both angles are also between the parallel lines.
9. A line which intersects a pair (set) of parallel lines.
10. The name given to lines which meet to make an angle.
12. - A 2D closed shape with 3 straight sides.
13. Often called a 'mirror image'.
15. The point where 2 lines meet.
17. Where sides of 2D shapes meet to form a 3D shape.
18. Moving an object around a centre of rotation, giving the angle of rotation and direction(clockwise or anticlockwise).

1. - Objects which are the same shape, and the same size.
3. - Made when 2 lines meet at a point.
4. - A 2D closed shape with 4 straight sides.
6. - Both angles are equal and on the same side of the transversal. They are are also both above, or both below, the parallel lines.
8. Moving an object or shape up, down, left or right without flipping, turning or changing size.
11. - A line drawn as part of a closed 2D shape.
14. The number of congruency tests for triangles.
16. An ordered set of moves that a shape can be shifted by.