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Level 431

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right angle

An angle that is 90 degrees (It makes a square in the corner).

Complementary

Two angles whose sum is 90 degrees.

Supplementary

Angles that add to 180 degrees.

Acute Angle

An angle that measures LESS than 90 degrees.

Obtuse Angle

An angle that measures MORE than 90 degrees

straight angle

An angle that measures 180 degrees

line segment

Part of a line with two end points.

Perpendicular Line Segment

Line Segments that intersect (cross) at an angle of 90°

Parallel Line Segment

Line segments that never intersect

Vertical Line Segment

a part of a line that extends vertically and has two endpoints

Horizontal Line Segment

straight line across

Angle

Two rays with the same end point.

point

an exact location in space

equilateral

all sides have the same length

Alternate

are equal.

transversal

A line that intersects two or more lines.

Adjacent

means "next to".

Complementary Angles

The sum of the measure of two angles is 90 degrees.

V.O

stands for Vertically opposite angles and are equal.

Supplementary Angles

The sum of the measure of two angles is 180 degrees.

corresponding angles

Angles that have the same relative positions in geometric figures.

Obtuse angles

are over 90 degrees.

Quadrilaterals

are four sided polygons

parallel lines

2 lines that never cross/intersect and stay the same distance apart

vertex

The point where two sides meet. (Shared end points of the line segments of a polygon.)

Co-interior angles

Angles that are both inside the parallel lines and on the same side of the transversal are supplementary.

Right Angles

if 2 angles are right angles, then they're congruent

Revolution angles

are full turn

Acute

Classifying by ANGLES

Reflex

means halfway, or more than 180 degrees but less than 360 degrees.

Bisector

if a line bisects a line segment, then it intersects it at its midpoint

Straight angles

are 180 degrees.

perpendicular

two lines that intersect and form a right angle are

degrees

a unit for measuring angles

Protractor

A tool used to measure angles