Geometry Terms and Definitions

Geometry Terms and Definitions

• Hierarchy: An arrangement of objects based on the relationships among their characteristics.
• Angle: Formed by two rays or lines sharing a common endpoint.
• Vertices (Vertex): The meeting point of two lines, creating an angle.
• Parallel Lines: Lines that never intersect, maintaining equal distance apart.
• Right Angle: Measures exactly 90 degrees, forming a perfect corner.
• Acute Angle: An angle measuring less than 90 degrees.
• Obtuse Angle: An angle measuring more than 90 degrees.

Two-Dimensional Figures

• Two-Dimensional Figures: Flat shapes characterized by only length and width, lacking depth.
• Polygon: A closed figure with at least three straight sides.
• Parallelogram: A four-sided shape (quadrilateral) with two pairs of parallel sides.
• Quadrilateral: Any four-sided figure.
• Trapezoid: A four-sided figure with one pair of parallel sides.

Specific Types of Polygons

• Rectangle: A quadrilateral with four right angles, where opposite sides are equal and parallel.
• Square: A special type of rectangle with four equal sides and four right angles.
• Triangle: A three-sided figure with varying properties depending on its side lengths and angles.

Triangle Classifications

• Rhombus: All four sides are of equal length, with opposite angles being equal.
• Isosceles Triangle: A triangle with two equal sides and angles.
• Equilateral Triangle: A triangle where all three sides and angles are equal (60 degrees each).
• Right Triangle: Contains one angle that measures 90 degrees.
• Scalene Triangle: A triangle with no equal sides or angles.
• Acute Triangle: All three angles measure less than 90 degrees.
• Obtuse Triangle: Contains one angle that exceeds 90 degrees.

Other Geometry Concepts

• Regular Polygon: A closed figure with sides and angles that are all congruent.
• Irregular Polygon: A closed figure with no sides or angles that are congruent.
• Congruent: Refers to sides or angles that are of equal measure.
• Degree: A unit used to quantify the size of angles.