Geometry Vocabulary

4. when two angles' measures add up to 90 degrees
6. a rigid transformation where a shape is rotated around a point
9. statement that can only be true if the other is true "if and only if"
11. ~p -> ~q: when you flip the hypothesis and conclusion then negate the statement
12. triangle that has two congruent base angles and two congruent sides
13. a rule that is accepted without proof
17. when two lines have the same slope, never meet, and are on the same plane
18. point of concurrency in a triangle where all of the perpendicular bisectors meet

1. form of writing the equation of a line: y=mx+b
2. two ratios set equal to each other
3. theorem that proves two triangles to be congruent: two sides are congruent and the included angle is congruent
5. polygon whose interior angles' measures add up to 720 degrees
6. all four sides of a quadrilateral are congruent
7. divides an angle into two congruent parts
8. transformation where a figure is mirrored across a line
10. two lines that meet at a 90 degree angle
13. theorem used to find the measure of the hypotenuse of a right triangle
14. similarity theorem where angle measures are equal in two triangles
15. when two shapes have proportionate sides and congruent angles; the shapes are this when they have been dilated
16. an infinite 2-dimensional space. Point,line,_____