Geometry Vocabulary Quiz

Geometry Vocabulary Study Notes

• Line: A continuous set of points extending infinitely in both directions, defined by two distinct points.
• Segment: A part of a line bounded by two distinct endpoints, containing all points in between.
• Plane: A flat, two-dimensional surface extending infinitely without thickness in all directions.
• Ray: A part of a line that has one endpoint and extends infinitely in the opposite direction.
• Acute Angle: An angle measuring less than 90 degrees.
• Vertex: The common endpoint of two rays that form an angle.
• Midpoint: The point that divides a line segment into two equal parts.
• Obtuse Angle: An angle measuring more than 90 degrees but less than 180 degrees.
• Complementary Angles: Two angles whose measures add up to 90 degrees.
• Supplementary Angles: Two angles whose measures add up to 180 degrees.
• Angle: Formed by two non-collinear rays sharing a common endpoint.
• Perpendicular Lines: Lines that intersect to form right angles (90 degrees).
• Vertical Angles: Non-adjacent angles formed by the intersection of two lines that are equal in measure.
• Straight Angle: An angle formed by opposite rays, measuring exactly 180 degrees.
• Congruent Figures: Geometric elements that have identical measures.
• Quadrant: The four sections of a Cartesian coordinate plane divided by the x-axis and y-axis.
• Coplanar Points: Points that lie within the same plane.
• Origin: The point where the x-axis and y-axis intersect in a coordinate system.
• Collinear Points: Points that lie on the same straight line.
• Adjacent Angles: Angles that share a common side but do not overlap.
• Point: A specific location in space, typically represented by a dot.
• Dimensions: The measurements defining the extent of an object in space (e.g., length, width, height).
• Parallel Lines: Lines that are in the same plane and do not intersect, remaining equidistant.
• Quadrilateral: A polygon characterized by four sides and four vertices.
• Circle: A flat shape where all points are equidistant from a center point.
• Face: A flat surface forming part of the boundary of a three-dimensional object.
• Edge: A line segment where two faces of a solid meet.
• Solid: A three-dimensional geometric figure.
• Prism: A solid figure with two parallel, congruent bases and rectangular sides.
• Diameter: A line segment passing through the circle's center with endpoints on the circle.
• Radius: The distance from the center of a circle to any point on its boundary.
• Perimeter: The total distance around a two-dimensional shape.
• Circumference: The distance around a circle, analogous to the perimeter for circles.
• Area: The measure of the space enclosed within a two-dimensional shape's boundary.
• 3D (Three-dimensional): Refers to objects possessing height, width, and length.
• Sphere: A set of all points in space equidistant from a central point.
• Surface Area: The total area of all external surfaces of a three-dimensional object.
• Volume: The measure of space contained within a solid, expressed in cubic units.
• Bisector: A line or segment that divides another line segment or angle into two equal parts.
• Decagon: A polygon with ten sides and vertices.
• Symmetry: A property where a shape remains invariant under transformations like rotation, reflection, or translation.
• Polygon: A plane figure defined by at least three straight sides and corresponding angles.
• Intersecting Lines: Lines that meet or cross at a single point.
• Parallelogram: A quadrilateral with both pairs of opposite sides parallel.
• Pentagon: A five-sided polygon.
• Hexagon: A six-sided polygon.
• Heptagon: A seven-sided polygon.
• Octagon: An eight-sided polygon.
• Nanogon: A nine-sided polygon.