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# U6L1Angles

### Terms for Angles and Triangles

A part of a line between two points on a line. line segment
A straight path connecting many points and extending in both directions. line
Angle between 0 deg and 90 deg. acute
Angles that add to 90 deg. complementary angles
Triangle with three 60 deg angles equilateral
A triangle with two equal angles isosceles
Angle between 90 deg and 180 deg. obtuse
Angle equal to 90 deg right angle
Triangle with 3 different side lengths scalene
Angles adding to 180 deg. supplementary
Formed when two rays come together at a common point called a vertex angle
A line that starts at one point and continues in a straight path. ray
A point where two rays meet vertex
Used to measure angles protractor
An angle greater than 180 deg. reflex angle