24 terms

# Basic Geometry Terms

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obtuse angle
An angle greater than 90 degrees
line
A straight path of point that goes on and on in two directions
angle
An angle is a figure formed by two rays that have the same point
parallel lines
In a plane, lines that never intersect
perpendicular lines
Two intersecting lines that form a right angle
1 ray
A ray is part of a line that has one end point
acute angle
An acute angle is smaller than a right angle
point
A point is a an exact location in space
polygon
Closed place figure made up of line segments
line segment
A part of a line with two end points
pentagon
5 sided figure
acute triangle
An acute triangle has three acute angles
equilateral triangle
triangle with three equal sides
Isosceles triangle
triangle with two equal sides
Intersecting lines
lines that cross at one point
a four sided polygon
octagon
an eight sided polygon
hexagon
a six sided polygon
side
each line segment is a side
right angle
a right angle is a 90 degree angle
straight angle
an angle that is a straight line, 180 degrees
triangle
a three sided polygon
vertex
where two sides meet
plane
an endless flat surface