1.
Acute: 0-89º
2.
acute angle: 1-89º
3.
Acute triangle: 3 acute angles
4.
Adjacent Angles: Angles that share a common vertex and side
5.
Angle: A figure formed by 2 rays with the same endpoint
6.
Collinear: 3 or more points that lie on the same line
7.
Complementary: Two angles whose measures have a sum of 90°
8.
Congruent: Of equal mesure
9.
Decagon: 10 sides
10.
Diagonal: A segment joining 2 nonconsecutive vertices
11.
endpoints: the end point
12.
Equalateral: All the sides are congruent. All the angles are 60º.
13.
hexagon: 6 sides
14.
Isoceles: At least 2 congruent sides
15.
Line: A straight line extending in both directions without end
16.
Midpoint: The point of a segment that divides it into 2 equal segments
17.
nonagon: 9 sides
18.
Noncollinear: 3 or more points that do not lie on the same line
19.
Obtuse: 91-180º
20.
obtuse: 91-180º
21.
Obtuse Triangle: Has one obtuse angle
22.
octagon: 8 sides
23.
Parallel lines: Lines in the same plane that do not intersect
24.
Parallel Planes: 2 planes that don't intersect
25.
parallelogram: a quadrilateral with 2 pairs of parallel sides
opposite sides are congruent
opposite angles congruent
26.
pentagon: 5 sides
27.
Perimeter: Distance around a figure
28.
Perpendicular: 2 lines that intersect to form 90º angles.
29.
Plane: A flat surface that extends forever in all directions
30.
Points: All figures in geometry are made up of these
31.
quadrilateral: 4 sides
32.
Ray: Point of a line with one endpoint
33.
rectangle: a parallelogram with 4 right angle
34.
Regular: All sides and angles are congruent
35.
rhombus: a parallelogram with 4 congruent sides
36.
Right: 90º
37.
right angle: 90º
38.
Right Triangle: Has one right angle
39.
Scalene Triangle: No congruent sides
40.
Segment: Part of a line with 2 endpoints
41.
septagon: 7 sides
42.
Side: The rays
43.
Skew lines: Non-intersecting, non-parallel lines
44.
square: rectangle with 4 congruent sides
45.
Supplementary: Two angles whose measures have a sum of 180°
46.
trapezoid: a quadrilateral with one pair of parallel sides
47.
Triangle: A figure formed by 3 noncollinear points connected by segments
48.
triangle: 3 sides
49.
Vertex: Common endpoint