Pre Algebra - Intro to Geometry

lrsjn a;fm'lwhuefewifknwkfl,nkieqjkmlrwm

Point

A location in space

Line

A series of points that extends in opposite directions without end

Plane

A flat surface that has no thickness and extends forever

Segment

Part of a line with two endpoints

Ray

A part of a line, with one endpoint, that continues without end in one direction

Parallel Lines

Lines in the same plane that never intersect

Skew Lines

Lines that do not intersect and are not co-planar

Adjacent Angles

Angles that share a vertex and a side but no points in their interiors

Vertical Angles

Two intersecting lines opposite of each other, with the same measure

Congruent Angles

Angles that have the same measure

Supplementary Angles

Two angles whose sum is 180 degrees

Complementary Angles

Two angles whose sum is 90 degrees

Transversal

A line that intersects two or more lines

Corresponding Angles

Angles in the same place on different lines

Alternate Interior Angles

Interior angles that lie on opposite sides of the transversal

Acute Triangle

3 acute angles

Right Triangle

A triangle with one right angle

Obtuse Triangle

A triangle with one angle that is greater than 90 degrees.

Equilateral Triangle

3 congruent sides

Isoceles triangle

a triangle that has at least 2 congruent sides

Scalene Triangle

A triangle with no equal sides

Trapezoid

A quadrilateral with exactly one pair of parallel sides

Parellelogram

a quadrilateral with 2 pairs of parallel sides

Rhombus

A parallelogram with four congruent sides

Rectangle

A parallelogram with four right angles

Square

A parallelogram with four congruent sides and four right angles.

Regular Polygon

A polygon with equal angles and equal sides.

Congruent Figures

Figures that have the same size and shape