Geometry Terms

1. Segment from the vertex to the opposite side. Also is perpendicular to the opposite side.
5. 3 sides of a triangle are congruent to 3 sides of another triangle. Therefore this makes the 2 triangles congruent.
7. A triangle where all 3 sides are congruent and all 3 angles are congruent. Each angle must be 60 degrees.
12. A line perpendicular to another segment. Segments cross at the midpoint.
14. Assuming that a conclusion is false. Then showing that assuming led to a contradiction.
15. A parallelogram with 4 congruent sides and 4 right angles. Also is a rectangle and a rhombus.
18. Segment that connects midpoint of legs. Parallel to the base and measure is 1/2 the sum of base lengthsd.
19. 2 sides of a triangle are congruent. Then the angles that are opposite means those sides are congruent.
20. A parallelogram with 4 congruent sides. Diagonals are perpendicular to eachother.

2. a+b>c and b+c>a. This makes a+c>b.
3. Point of concurrency for perpendicular bisector. Equidistant from each vertex.
4. When 2 angles and the non-included side of a triangle are congruent to 2 angles and the non-included side of another triangle. Therefore making the 2 triangles congruent.
6. Quadrilateral with exactly 2 pairs consecutive sides. Diagonals are perpendicular.
8. Point of concurrency of angle bisectors. Equidistant to each side of the triangle.
9. Point of concurrency of altitudes. Lines are perpendicular.
10. Indirect reasoning/proofs. Temporarily assuming that what we are trying to prove is false.
11. If a quadrilateral is a parallelogram, then its diagonals bisect each other. If a quadrilateral is a parallelogram, then each diagonals separates the parallelogram into 2 congruent triangles.
13. Sum of interior angles of n-sided polygon. (n-2)x180=sum of angles.
16. all angles are right angles. Opposite sides are parallel and congruent.
17. Point of concurrency of median. 2/3 of the distance form each vertex.