# Geometry Vocabulary/Definitions

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Square
A quadrilateral with 4 equal sides and 4 right angles. Opposite sides are parallel.
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Rectangle
A Quadrilateral with 4 sides and 4 right angles. Opposite sides are parallel.
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Triangle
A polygon with 3 sides and 3 angles.
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Circle
A polygon made with a continuous line which is always the same distance from the center.
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Line
A straight path that goes without end in two directions.
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Ray
Part of a line that has one end point and goes in one direction without end.
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Line Segment
Part of a line with two end points.
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Angle
Two rays with the same end point.
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Right Angle
An angle that is 90 degrees (It makes a square in the corner).
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Side
Line segments of a polygon.
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Vertex
The point where two sides meet. (Shared end points of the line segments of a polygon.)
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A polygon with 4 sides and 4 angles.
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Parallelogram
A quadrilateral (4 sides & 4 angles) where opposites sides are parallel. (ie: Rectangle, square, rhombus, & diamond are parallograms)
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Trapezoid
A quadrilateral (4 sides & 4 angles) with one pair of parallel sides.
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Rhombus
a parallelogram with four equal sides and equal opposite angles.
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Equilateral triangle
A triangle that has 3 equal sides.
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Isosceles Triangle
A triangle that has 2 equal sides.
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Right Triangle
A triangle that has one right angle. It can also be an isosceles or scalene triangle.
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Scalene Triangle
A triangle that has no equal sides. All 3 sides are different lengths.
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Congruent
A plane figure with the same size and shape.
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Symmetry
A plane figure that can be folded along a line so the two parts match.
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Line of Symmetry
The line that divides two matching parts. It can be vertical, horizontal, or diagonal.
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Perimeter
The distance around the figure.
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Area
The size a surface takes up, measured in square units.
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Rectangular Prism
A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.
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Cube
A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), and 12 equal edges.
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Sphere
A solid shape that is perfectly round like a ball. No faces, edges, or vertices.
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Cone
A solid shape with a circular base and a curved surface that come to a point (vertex).
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Cylinder
A solid shape with one curved surface and two congruent circular bases.
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Pyramid
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
The amount of space occupied by a 3D object, measured in cubic units.
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Face
The flat surface of a 3D shape.
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Edge
Where two surfaces join (intersect).
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Plane
A flat surface.
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Plane shape