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Geometry Vocabulary
4th-5th Grade Geometry Vocabulary
Term | Definition |
---|---|
Point | An exact location |
Line | Is straight, has no bends, and extends in both directions without end |
Line Segment | Part of a line that connects two points |
Ray | A line with a single endpoint |
Plane | A flat, two-dimensional surface that extends infinitely far |
Intersecting Lines | Two lines that intersect (cross) but do not form right angles |
Parallel Lines | Two lines that will never intersect |
Perpendicular Lines | Two lines that intersect and form right angles |
Right Angle | An angle that measures 90° |
Obtuse Angle | An angle that measures more than 90° |
Acute Angle | An angle that measures less than 90° |
Vertex | Point at which two line segments intersect (forming an angle) |
Scalene Triangle | A triangle with all three sides with different lengths |
Isosceles Triangle | A triangle with two equal length sides (and two equal internal angles) |
Equilateral Triangle | A triangle with all three sides of equal length (each internal angles = 60°) |
Rhombus | A quadrilateral in which opposite sides are parallel and all four sides are of equal length |
Rectangle | A quadrilateral with four right-angles and opposite sides that are parallel |
Square | A quadrilateral with equal-length sides forming four right-angles |
Parallelogram | A quadrilateral in which each of the two pairs of opposite sides are parallel |
Trapezoid | A quadrilateral with only one pair of parallel sides |
Quadrilateral | A four-sided polygon |
Polygon | A figure with at least three straight sides and angles, and typically five or more |