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# Unit 4 Math

### Circles, lines, and angles

A part of a line that has one end point and extends without end in one direction. Ray
A figure formed by two rays or line segments with a common endpoint. Angle
A straight path that goes on forever in opposite directions. Line
Lines, line segments, or rays are this if they form right angles. Perpendicular
The same distance apart at every point. Parallel
Lines that are not parallel or perpendicular. Oblique
To cut or divide by passing through or across. Intersect
A tool used to measure angles. Protractor
A unit for measuring angles or temperature. Degree
An angle that measures 90 degrees. Right Angle
An angle that is 180 degrees. Straight Angle
Angles having a sum of 180 degrees. Supplementary Angles
Angles having the some of 90 degrees. Complementary Angles
When two angles intersect they form these angles. Opposite Angle
These are pairs of opposite angles formed by intersecting lines. Vertical Angle
A closed plane figure with sides made of straight line segments. Polygon
Exactly the same size and shape. Congruent
A triangle with at least two congruent sides. Isosceles Triangle
Having all equal sides. Equilateral Triangle
A triangle with no equal sides. Scalene Triangle
A triangle with three acute angles. Acute Triangle
A triangle with one obtuse angle. Obtuse triangle
A triangle with one right angle. Right Triangle
A trapezoid with one right angle. Right Trapezoid
A plane figure that forms a closed path so that all the points on the path are the same distance from a point called the center. Circle
An angle greater than 180 degrees. Reflex Angle
Created by: 00020687