Angles
Polygons
More Angles
Miscellaneous
100
Measures less than 90°
What is acute angle?
100
Means “many angles.”
What is polygon?
100
Angles that are completely inside the polygon.
What are interior angles?
100
The most rigid polygon.
What is a triangle?
200
Measures exactly 90°
What is right angle?
200
A polygon in which all of the sides are the same length & all of the angles have the same measure.
What is regular polygon?
200
Measures exactly 180°
What is straight angle?
200
Lines in a plane that never meet.
What is parallel lines?
300
Two angles whose sum equals 90°.
What are complementary angles?
300
Not all of the sides and angles are equal.
What is irregular polygon?
300
Measures between 90° and 180°.
What is obtuse angle?
300
A quadrilateral in which the 2 pairs of opposite sides are parallel.
What is parallelogram?
400
Angles made by extending a side of a convex polygon. These lie outside the polygon.
What is exterior angle?
400
Have clear points on the inside and outside. Interior measure less than 180°.
What is convex polygon?
400
Two angles whose sum equals 180°.
What are supplementary angles?
400
A line that intersects two other lines.
What is transversal?
500
Opposite pairs of angles that are formed when two lines intersect. They are always congruent.
What are vertical angles?
500
Polygon with at least one interior angle whose measure is greater than 180°.
What is concave polygon?
500
Angles that share a common side.
What are adjacent angles?
500
Measures between 180° and 360°.
What is reflex angle?
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