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4th Grade Geometry DCA Vocabulary
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square (tell me about the sides and angles)
4 sides of equal length and 4 right angles
rhombus (tell me about the sides and angles)
4 sides of equal length, 2 acute and 2 obtuse angles
parallelogram (tell me about the sides and angles)
2 pairs of parallel sides, 2 acute and 2 obtuse angles
rectangle (tell me about the sides and angles)
opposite sides are parallel and equal and has 4 right angles
trapezoid
exactly 1 pair of parallel sides
scalene triangle
no sides of equal length
isosceles triangle
It has 2 sides of equal length.
equilateral triangle
It has 3 sides of equal length.
right triangle
one right angle and 2 acute angles
obtuse triangle
a triangle with one obtuse angle and 2 acute angles
acute triangle
a triangle with 3 acute angles
right angle
measures exactly 90 degrees
obtuse angle
Measures greater than 90, less than 180
acute angle
Measures greater than 0, less than 90
perpendicular lines
Lines that intersect to form right angles
intersecting lines
Lines that cross each other at exactly one point
parallel lines
Lines that never intersect and are always the same distance apart
an exact location in space
point
Ray
part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
Line Segment
part of a line that consists of two points called endpoints and all points between them
What is a line?
straight path that extends in two opposite directions without end