Triangle Congruence
by Tyanna Lee
1. rigid transformation
1.1. is a transformation of the plane that preserves length
2. acute triangle
2.1. triangle with all three angles acute (less than 90°)
3. equiangular triangle
3.1. a triangle where all three interior angles are equal in measure.
4. obtuse triangle
4.1. is a triangle in which one of the angles is an obtuse angle.
5. isosceles triangle
5.1. an isosceles triangle is a triangle that has two sides of equal length
6. auxiliary line
6.1. is an extra line needed to complete a proof in plane geometry
7. interior
7.1. emote from the coast or frontier; inland.
8. interior angle
8.1. the angle between adjacent sides of a rectilinear figure.
9. remote interior angle
9.1. In a triangle, each exterior angle has two remote interior angles
10. isometry
10.1. include rotation, translation, reflection, glides, and the identity map
11. dilation
11.1. the action of speaking or writing at length
12. right triangle
12.1. a triangle that is 90 degrees
13. equilateral triangle
13.1. a triangle in which all three sides are equal.
14. scalene triangle
14.1. is a triangle that has three unequal sides, such as those illustrated above.
15. corollary
15.1. forming a proposition that follows from one already proved.
16. exterior
16.1. forming, situated on, or relating to the outside of something
17. exterior angle
17.1. the angle between a side of a rectilinear figure and an adjacent side extended outward.
