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Geometry flash cards for my math class. (In my examples, this sign: < is supposed to be an angle sign)

### Supplementary angles

Two angles whose sum is 180 degrees.
EX: <ACB + <BCD = 60 + 120 = 180 degrees.

### Complementary angles

Two angles whose sum is 90 degrees.

### Acute angle

An angle less than 90 degrees but more than 0 degrees.

### Point

An exact location in space.

### Obtuse angle

An angle whose measure is greater than 90 degrees, but less than 180 degrees.

### Line

A straight path that extends without end in opposite directions.

### Right angle

An angle that measures 90 degrees.

### Ray

(mathematics) a straight line extending from a point

### Plane

(mathematics) an unbounded two-dimensional shape

### Vertical angles

a pair of opposite congruent angles formed by intersecting lines

### Parallel lines

coplanar lines that do not intersect

### Perpendicular lines

Two lines that intersect to form right angles

### Acute Triangle

a triangle whose interior angles are all acute

### Obtuse Triangle

a triangle with one obtuse angle

### Equilateral triangle

a triangle with three congruent sides

### Isosceles triangle

a triangle with two congruent sides

### Scalene triangle

a triangle with no two sides of equal length

### Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.

Example: