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# geometry

TermDefinition
Line a straight path of points that goes on in 2 direction
Ray part of a line. I has only one endpoint and extends forever in one direction
parallel lines never cross and stay the same distance apart
perpendicular lines are intersecting lines that form square corners
point an exact location in a space
line segment part of a line and has 2 endpoints
plane an endless flat surface
angle formed by two rays that have the same endpoint.
acute angle has a measure between 0˚ and 90˚
right angle has a measure of 90˚
obtuse angle Has a measure between 90˚ and 18˚
straight angle Has a measure of 180˚
vertex common endpoint
protractor to measure and draw angles
degrees What angles are measured in
polygon closed plane figure made up of line segments
regular polygon sides of equal length and angles of equal measure
triangle 3 sides ∆
pentagon 5 sides
hexagon 6 sides
octagon 8 sides
equilateral triangle all sides are the same length
isosceles triangle Two sides are the same length
scalene triangle No sides are the same length
right triangle One angle is a right angle
acute triangle All three angles are acute angles
obtuse triangle one angle is an obtuse angle
parallelogram both pairs of opposite sides parallel and equal in length
trapezoid only one pair of parallel sides
rectangle a parallelogram with four right angles
rhombus a parallelogram with all sides the same length
square a rectangle with all ides the same length
generalization general statement
Created by: 17thinto

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