Share 4th Grade Geometry DCA Vocabulary
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What is a line?
straight path that extends in two opposite directions without end
Line Segment
part of a line that consists of two points called endpoints and all points between them
Ray
part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
an exact location in space
point
parallel lines
Lines that never intersect and are always the same distance apart
intersecting lines
Lines that cross each other at exactly one point
perpendicular lines
Lines that intersect to form right angles
acute angle
Measures greater than 0, less than 90
obtuse angle
Measures greater than 90, less than 180
right angle
measures exactly 90 degrees
acute triangle
a triangle with 3 acute angles
obtuse triangle
a triangle with one obtuse angle and 2 acute angles
right triangle
one right angle and 2 acute angles
equilateral triangle
It has 3 sides of equal length.
isosceles triangle
It has 2 sides of equal length.
scalene triangle
no sides of equal length
