Grade7_Geometry Overview

1. Angles Angles located outside two parallel lines and on opposite sides of a transversal; they are equal.
5. The point at which a line or curve intersects an axis on a graph.
6. Two angles that share a common side and vertex, and do not overlap.
11. A transformation that slides a figure from one position to another without turning it.
13. The total measure of all angles in a polygon; for a triangle, it is 180 degrees.
14. A transformation in which a figure is turned around a fixed point.
16. A point where two or more lines or edges meet.
17. When two figures have the same shape but may differ in size, achieved through a sequence of transformations.
18. Lines in a plane that never meet; they are always the same distance apart.
21. When two figures are identical in shape and size, and one can be transformed into the other via translation, rotation, or reflection.
24. A transformation producing a mirror image of a figure over a line.
25. Angles on the inside of a polygon.
26. The original figure before a transformation.
27. A transformation that alters the size of a figure but not its shape by expanding or contracting it by a scale factor relative to a fixed point.
28. A line that passes through two lines in the same plane at two distinct points.
29. Angles Angles located inside two parallel lines and on opposite sides of a transversal; they are equal.

2. A general term for four specific ways to manipulate the shape or position of a figure: translation, rotation, reflection, or dilation.
3. Angles opposite each other when two lines cross; they are equal.
4. A transformation in which the original figure and its image are congruent.
7. An angle formed outside a polygon when one side is extended.
8. Angles in the same relative position at each intersection when a transversal crosses two lines.
9. The point that divides a line segment into two equal parts.
10. A two-dimensional surface on which points are plotted and located using a pair of numbers (coordinates).
12. A number which scales, or multiplies, some quantity in a dilation.
15. A method for determining the similarity of two triangles if two angles of one triangle are equal to two angles of another triangle.
19. A line that divides a figure into two identical parts, each a mirror image of the other.
20. A line around which a shape is rotated.
22. Two angles whose measures add up to 90 degrees.
23. Lines that intersect at a right angle (90 degrees).
30. The resulting figure after a transformation.