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Math
Geometry
Pre-Algebra Chapter 11 Sections 1-2
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Terms in this set (23)
Vertical angles
Two lines which intersect and form opposite, congruent angles.
Adjacent angles
Angles that are on the same side and have the same vertex - angles that are next to each other.
Supplementary angles
Two angles whose sum is 180 degrees
Complementary angles
Two angles whose sum is 90 degrees
Right angle
90 degree angle
Perpendicular
When two lines intersect, or cross, to form a 90 degree angle
Parallel lines
Two lines in a plane that never intersect.
Transversal
A line that intersects two or more other lines in a plane.
Alternate interior angles
Angles are on opposite sides of the transversal and inside the parallel lines.
Corresponding angles
Angles that are in the same position on two parallel lines in relation to a transversal.
Alternate exterior angles
Angles that lie on opposite sides of the transversal and outside the parallel lines.
Ray
A part of a line that starts at an endpoint and extends forever in one direction
Line segment
Part of a line containing two endpoints and all of the points between them.
Triangle
Formed by three line points that intersect only at their endpoints.
Vertex
Point where the segments of a triangle intersect.
Interior angles
The three angles that lie inside of a triangle.
Exterior angles of a triangle
Formed by one side of the triangle and the extension of the adjacent side.
Acute triangle
A triangle in which all angles are less than 90 degrees.
Obtuse angle
An angle between 90 and 180 degrees.
Right triangle
A triangle with one 90degree angle.
Scalene triangle
A triangle with no congruent sides.
Isosceles triangle
Has at least two sides and two angles that are congruent.
Equilateral triangle
A triangle with three congruent sides.
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