3rd Grade Geometry Vocabulary
3rd grade Geometry Vocabulary with term definitions.
Terms in this set (28)
A quadrilateral with 4 equal sides and 4 vertices that form right angles.
Opposite sides are parallel.
A quadrilateral with 4 sides and 4 vertices that form right angles.
Opposite sides are equal and parallel.
A polygon with 3 sides and 3 vertices.
A plane shape made with a continuous line which is always the same distance from the center. It has no sides and no vertices.
A straight path that goes without end in opposite directions.
Part of a line with two end points.
A 90 degree angle that makes a square corner.
Line segments of a polygon.
The point where two sides meet.
Any polygon with 4 sides and 4 angles.
Any quadrilateral with opposite parallel sides. Example: rectangle, rhombus, square
A quadrilateral with one pair of parallel sides.
A parallelogram with four equal sides and equal opposite angles.
A plane figure with the same size and shape.
A plane figure that can be folded along a line so the two parts match.
Line of Symmetry
The line that divides two matching parts. It can be vertical, horizontal, or diagonal.
The distance around the figure.
The size a surface takes up, measured in square units.
A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices, and 12 edges.
A solid shape that has: 6 square faces all equal in size, 8 vertices, and 12 equal edges.
A solid shape that is perfectly round like a ball. No faces, edges, or vertices.
A solid shape with a circular base, 1 curved edge, and a curved surface that comes to a point (vertex or apex).
A solid shape with one curved surface, 2 curved edges and two circular bases.
A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)
The flat surface of a 3D shape.
Where two faces meet (intersect).
A flat closed shape having only 2 dimensions.
Lines that do not cross (intersect) and are always the same distance apart.
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