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Geometry Vocabulary/Definitions (3rd grade)
3rd grade Geometry Vocabulary with term definitions.
Terms in this set (36)
A quadrilateral with 4 equal sides and 4 right angles.
Opposite sides are parallel.
A Quadrilateral with 4 sides and 4 right angles.
Opposite sides are parallel.
A polygon with 3 sides and 3 angles.
A polygon made with a continuous line which is always the same distance from the center.
A straight path that goes without end in two directions.
Part of a line that has one end point and goes in one direction without end.
Part of a line with two end points.
Two rays with the same end point.
An angle that is 90 degrees (It makes a square in the corner).
Line segments of a polygon.
The point where two sides meet. (Shared end points of the line segments of a polygon.)
A polygon with 4 sides and 4 angles.
A quadrilateral (4 sides & 4 angles) where opposites sides are parallel. (ie: Rectangle, square, rhombus, & diamond are parallograms)
A quadrilateral (4 sides & 4 angles) with one pair of parallel sides.
a parallelogram with four equal sides and equal opposite angles.
A triangle that has 3 equal sides.
A triangle that has 2 equal sides.
A triangle that has one right angle. It can also be an isosceles or scalene triangle.
A triangle that has no equal sides. All 3 sides are different lengths.
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 (corners), and 12 equal edges.
A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), 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 and a curved surface that come to a point (vertex).
A solid shape with one curved surface and two congruent circular bases.
A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)
The amount of space occupied by a 3D object, measured in cubic units.
The flat surface of a 3D shape.
Where two surfaces join (intersect).
A flat surface.
A flat closed shape having only 2 dimensions.
A flat figure that can be closed or not closed.
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