# Geometry Vocabulary/Definitions

## Unlock all answers in this set

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