Geometry Vocab

ray

• an exact location in space

• an endless collection of points along a straight path

• part of a line that has two end points

• part of a line that has one endpoint and extends endlessly in the other direction

an endless flat surface that is named by any three parts not in the same line

• space

• plane

• ray

• shape

lines that have exactly one point in common; lines that touch

• intersecting lines

• touching lines

• perpendicular lines

• crossing lines

lines in the same plane that never intersect; lines that never touch

• perpendicular lines

• parallel lines

• intersecting lines

• touching lines

perpendicular lines

• two lines that intersect at right angles

• an endless flat surface that is named by any three parts not in the same line

• lines that have exactly one point in common; lines that touch

• lines in the same plane that never intersect; lines that never touch

An angle exactly 90 degrees

• right

• acute

• obtuse

• straight

obtuse angle

• exactly 90 degree

• less than 90 degrees

• exactly 180 degrees

• an angle more than 90 degrees but less than 180 degrees

a closed plane figure with 3 or more sides

• shape

• polygon

• point

• circle

5-sided polygon

• quadrilateral

• pentagon

• triange

• plane

obtuse triangle

• an angle more than 90 degrees but less than 180

• a triangle with one angle more than 90 degrees

• a triangle with one right angle

• a triangle with 3 acute angles