Angles and Polygons

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An angle smaller than a right angle
Acute angle
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90 degrees or a one-quarter turn
Right angle
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Greater than 90 degrees but smaller than 180 degrees
Obtuse angle
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Greater than 180 degrees but smaller than 360 degrees
Reflex angle
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When referring to parallel lines: angles in the corners of a Z shape
Alternate angles
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When referring to parallel lines: angles under the arms of an F shape
Corresponding angles
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A direction defined by a three-figure angle measured clockwise from north.
Three-figure bearing
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A 2D shape with straight edges
A polygon
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All sides are equal and all angles are equal
Regular
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A three sided polygon
A triangle
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A four sided polygon
A quadrilateral
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Exactly the same shape and size
Congruent
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The same shape but different in size.
Similar
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The ratio of corresponding lengths in two similar shapes.
Scale factor
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The angle between tow sides inside a polygon.
Interior angle
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The angle between one side of a polygon and the next side extended.
Exterior angle
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Other cards in this set

Card 2

Front

90 degrees or a one-quarter turn

Back

Right angle

Card 3

Front

Greater than 90 degrees but smaller than 180 degrees

Back

Preview of the front of card 3

Card 4

Front

Greater than 180 degrees but smaller than 360 degrees

Back

Preview of the front of card 4

Card 5

Front

When referring to parallel lines: angles in the corners of a Z shape

Back

Preview of the front of card 5
View more cards

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