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Concepts of Angles & Angle Measurement
Vocabulary
A straight path of points that goes on and on in opposite directions is called a line.
A part of a line that has one endpoint and continues on forever in one direction is called a ray.
An acute angle is a angle that is open less than a right angle and has measure less than 90 degrees.
A straight angle is an angle that forms a straight line and has a measure of 180 degrees.
A point is an exact location in space.
A part of a line with two endpoints is called a line segment.
A right angle is an angle that forms a square corner and has a measure of 90 degrees.
An obtuse angle is an angle that is open more than a right angle but less than a straight angle. This angle measures between 90 degrees and 180 degrees.
An angle that turns through 1/360 of a cricle and measures 1 degree is called a unit angle.
A protractor is a tool used to measure and draw angles
Angles can be measured using a unit called a degree.
The number of degrees an angle turns through is its angle measure.
The point where two rays meet to form an angle is called a vertex.
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