Geometry Vocabulary/Definitions

8 September 2022
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Square
Square
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A quadrilateral with 4 equal sides and 4 right angles. Opposite sides are parallel.
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Rectangle
Rectangle
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A Quadrilateral with 4 sides and 4 right angles. Opposite sides are parallel.
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Triangle
Triangle
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A polygon with 3 sides and 3 angles.
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Circle
Circle
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A polygon made with a continuous line which is always the same distance from the center.
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Line
Line
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A straight path that goes without end in two directions.
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Ray
Ray
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Part of a line that has one end point and goes in one direction without end.
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Line Segment
Line Segment
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Part of a line with two end points.
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Angle
Angle
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Two rays with the same end point.
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Right Angle
Right Angle
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An angle that is 90 degrees (It makes a square in the corner).
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Side
Side
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Line segments of a polygon.
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Vertex
Vertex
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The point where two sides meet. (Shared end points of the line segments of a polygon.)
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Quadrilateral
Quadrilateral
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A polygon with 4 sides and 4 angles.
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Parallelogram
Parallelogram
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A quadrilateral (4 sides & 4 angles) where opposites sides are parallel. (ie: Rectangle, square, rhombus, & diamond are parallograms)
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Trapezoid
Trapezoid
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A quadrilateral (4 sides & 4 angles) with one pair of parallel sides.
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Rhombus
Rhombus
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a parallelogram with four equal sides and equal opposite angles.
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Equilateral triangle
Equilateral triangle
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A triangle that has 3 equal sides.
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Isosceles Triangle
Isosceles Triangle
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A triangle that has 2 equal sides.
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Right Triangle
Right Triangle
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A triangle that has one right angle. It can also be an isosceles or scalene triangle.
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Scalene Triangle
Scalene Triangle
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A triangle that has no equal sides. All 3 sides are different lengths.
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Congruent
Congruent
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A plane figure with the same size and shape.
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Symmetry
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A plane figure that can be folded along a line so the two parts match.
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Line of Symmetry
Line of Symmetry
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The line that divides two matching parts. It can be vertical, horizontal, or diagonal.
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Perimeter
Perimeter
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The distance around the figure.
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Area
Area
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The size a surface takes up, measured in square units.
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Rectangular Prism
Rectangular Prism
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A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.
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Cube
Cube
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A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), and 12 equal edges.
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Sphere
Sphere
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A solid shape that is perfectly round like a ball. No faces, edges, or vertices.
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Cone
Cone
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A solid shape with a circular base and a curved surface that come to a point (vertex).
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Cylinder
Cylinder
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A solid shape with one curved surface and two congruent circular bases.
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Pyramid
Pyramid
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A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)
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Volume
Volume
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The amount of space occupied by a 3D object, measured in cubic units.
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Face
Face
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The flat surface of a 3D shape.
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Edge
Edge
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Where two surfaces join (intersect).
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Plane
Plane
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A flat surface.
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Plane shape
Plane shape
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A flat closed shape having only 2 dimensions.
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Plane figure
Plane figure
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A flat figure that can be closed or not closed.
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point
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A dot that specifies only location; it has no length, width, or depth. We usually represent a it with a dot on paper, but the dot we make has some dimension, while a true point has dimension 0. . B (point B)
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Perpendicular Lines
Perpendicular Lines
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Two lines that intersect to form right angles