# Angles and Polygons

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An angle smaller than a right angle
Acute angle
1 of 16
90 degrees or a one-quarter turn
Right angle
2 of 16
Greater than 90 degrees but smaller than 180 degrees
Obtuse angle
3 of 16
Greater than 180 degrees but smaller than 360 degrees
Reflex angle
4 of 16
When referring to parallel lines: angles in the corners of a Z shape
Alternate angles
5 of 16
When referring to parallel lines: angles under the arms of an F shape
Corresponding angles
6 of 16
A direction defined by a three-figure angle measured clockwise from north.
Three-figure bearing
7 of 16
A 2D shape with straight edges
A polygon
8 of 16
All sides are equal and all angles are equal
Regular
9 of 16
A three sided polygon
A triangle
10 of 16
A four sided polygon
11 of 16
Exactly the same shape and size
Congruent
12 of 16
The same shape but different in size.
Similar
13 of 16
The ratio of corresponding lengths in two similar shapes.
Scale factor
14 of 16
The angle between tow sides inside a polygon.
Interior angle
15 of 16
The angle between one side of a polygon and the next side extended.
Exterior angle
16 of 16

## Other cards in this set

### Card 2

#### Front

90 degrees or a one-quarter turn

Right angle

### Card 3

#### Front

Greater than 90 degrees but smaller than 180 degrees

### Card 4

#### Front

Greater than 180 degrees but smaller than 360 degrees

### Card 5

#### Front

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