Geometry S1

5. this is always the first reason in any two column proof
7. if two figures are congruent, then the ____ parts of those figures must also be congruent
9. type of triangle that has two congruent sides and two congruent base angles
11. lines that never intersect
12. another word for rate of change
15. the first step in solving fraction busters is to find a common ____
17. a stretch or compression of a figure in all directions
18. term used when figures have the same shape and the same size
20. term used when figures have the same shape, but different size
21. angles that sum to 180 degrees

1. a negative number multiplied by a negative number results in a ___ number
2. formula use when given the point on a line and the slope; y - y1 = m(x-x1)
3. a segment, point, or ray that splits a line into two congruent parts
4. lines formed when two angles intersect at 90 degrees
6. transformations that maintain congruency
8. a flip over a line; a rigid transformation that takes a point to another point the same distance and perpendicular on the opposite side of a line
10. what it is called when you multiply a number or variable by itself
13. congruent angles that are formed when two lines intersect
14. a turn around a fixed point
16. perpendicular lines have slopes that are ___ reciprocals
19. parallel lines have the ___ slope