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1.
2 points: __________ determine a line, ray, or segment

2.
acute: a triangle in which all angles are acute

3.
altitude: a line segment drawn from any vertex of the triangle to the opposite side, extended if necessary, and perpendicular to that side.

4.
ASA: if there exists a correspondance between the vertices of two triangles such that 2 angles and the included side are congruent to the corresponding parts to the other triangle, the two triangles are congruent.

5.
auxiliary line: a line that can be added to a figure to help solve a problem or a proof

6.
auxiliary lines: connect two points already in the diagram (usually)

7.
base angles: the two congruent angles by the base of an isosceles triangle

8.
center: how the circle is named by

9.
centroid: the point where 3 medians of a triangle intersect

10.
circumcenter: the point of intersection for the perpendicular bisectors of a triangle

11.
congruent triangles (and polygons): all pairs of corresponding parts are congruent

12.
CPCTC: corresponding parts of congruent triangles are congruent

13.
equiangular: a triangle in which all angles are congruent

14.
equilateral: a triangle in which all sides are congruent

15.
hypotenuse: the side opposite the right angle

16.
incenter: the point of concurrency for the angle bisectors of a triangle

17.
isosceles: a triangle in which at least two sides are congruent

18.
legs: the sides that form the right angle;

the sides that form the vertex angle

the sides that form the vertex angle

19.
median: a line segment dran from any vertex of the triangle to the midpoint of the opposite side.

20.
obtuse: a triangle in which one of the angles is an obtuse angle

21.
orthocenter: the point of concurrency for the altitudes of a triangle

22.
radii: all _________ of a circle are all congruent

23.
reflexive property: when the side or angle is congruent to itself

24.
right: a triangle in which one of the angles is a right angle

25.
rim: the outline of a circle

26.
SAS: if there exists a correspondance between the vertices of two triangles such that 2 sides and the included angle of one triangle are congruent to the corresponding part of the other triangle, the two triangles are congruent./

27.
scalene: a triangle in which no two sides are congruent

28.
SSS: if there exists a correspondance between the vertices of two triangles such that 3 sides of one triangle are congruent to the corresponding sides of the other triangle, the two triangles are congruent

29.
vertex angle: the angle of an isosceles triangle with the 2 included sides

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