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Level 430

Angles


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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