18 terms

Geometry Vocabulary-

unit 3 terms
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acute angle
an angle less than 90 degrees but more than 0 degrees
obtuse angle
an angle between 90 and 180 degrees
perpendicular lines
lines that intersect to form right angles
point
a location in space. It takes only one letter to name me.
line segment
a line that connect 2 points
part of a line with two endpoints
parallel lines
lines that will never meet;
lines that never intersect
vertex
The common endpoint of an angle, the point where two rays, lines or line segments meet to form an angle
intersecting
lines, rays or segments that cross
right angle
an angle that measures 90 degrees
straight angle
an angle that measures 180 degrees
isosceles triangle
A triangle with two congruent sides
scalene triangle
A triangle with no congruent sides; no sides are equal
equilateral triangle
a triangle with 3 congruent sides
congruent
same shape and same size
right triangle
a triangle with one right angle
ray
a straight path that extends infinitely from an endpoint
line
a straight path that extends infinitely in oppposite directions
quadrangle
a polygon with 4 sides and 4 angles