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# 7th Geometry

### Angles, Triangles

Ray A part of a line that has one fixed end point and extends infinitely along the line from the end point.
Angle A figure formed by two rays.
Vertex A point where two or more lines come together.
Acute angle An angle less than 90 degrees
Right angle An angle equal to 90 degrees
Obtuse angle An angle greater than 90 degrees but less than 180 degrees
Straight angle An angle that equals 180 degrees
Supplementary angle Two angles that total 180 degrees.
Complementary angle Two angles that total 90 degrees.
Adjacent angles Two angles that share the same vertex, but do not have any other relationship.
Vertical angles A pair of angles opposite intersection lines. Vertical angles are equal to each other.
Equilateral triangle A triangle that has ALL sides the same length
Isosceles triangle A triangle that has EXACTLY two sides equal.
Scalene triangle A triangle in which ALL sides are NOT the same
Acute triangle A triangle with all three angles that are less than 90 degrees
Right triangle A triangle with a 90 degree angle
Obtuse triangle A triangle that has one angle more than 90 degrees
Created by: MsHarkness

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