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# 4th M Geometry Terms

### 4th Geometry Terms

point an exact location in space
plane an endless flat surface
parallel lines that never intersect (they don't cross)
perpendicular lines lines that form square corners where they cross
intersecting lines lines that pass through the same point
ray a part of a line segment that has one endpoint and continues on forever in one direction
line segment a part of a line with two endpoints
right angle an angle that forms a square corner ( it is exactly 90 degrees)
acute angle an angle that is open less than a right angle (it is less than 90 degrees)
obtuse angle an angle that is open more than a right angle but less than a straight angle (it is more than 90 degrees, but less than 180 degrees)
straight angle an angle that forms a straight line (it is exactly 180 degrees)
degree a unit measurement of angles
protractor a tool used to measure and draw angles
vertex the point where two rays meet to form an angle
right triangle a triangle that has one right angle
acute triangle a triangle that has 3 acute angles
obtuse triangle a triangle that has one obtuse angle
parallelogram a quadrilateral that has two pairs of parallel sides
rectangle a quadrilateral that has four right angles
square a quadrilateral that has four right angles and all four sides are the same length
rhombus a quadrilateral in which opposite sides are parallel and all of its sides are the same length
trapezoid a quadrilateral with only one pair of parallel sides
polygon a flat two-dimensional shape with straight sides that are fully closed, the sides must be straight NOT curved, they can have any number of sides
line of symmetry the line on which a figure can be folded so both halves are the same
Created by: casonb
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