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# Unit 8: Geometry

TermDefinition
Acute angle n angle that measures less than 90°
Area of a base the area of a 2D figure that the surface of a solid object sits/stands on
Area the measurement attribute that describes the number of square units a figure or region covers ** A= LXW**
Congruent of equal measure, having exactly the same size and same shape
Obtuse Angle an angle that measures greater than 90° but less than 180°
Parallel Lines lines that lie in the same plane, never intersect, and are always the same distance apart; opposite sides
Parallelogram a quadrilateral with opposite sides that are parallel
Perimeter a linear measurement of the distance around the outer edge of a figure; **P= s + s + s + s......**
Perpendicular Lines lines that intersect to form right angles
Polygon a closed figure with at least 3 sides, where all sides are straight (no curves)
Quadrilateral a polygon with 4 sides, 4 angles, and 4 vertices
Rectangle a parallelogram with 4 right angles
Rectangular Prism a 3D solid with six faces that are all rectangles
Rhombus a parallelogram with 4 equal sides; opposite equal acute angles, and opposite equal obtuse angles
Right Angle an angle that measures exactly 90 degrees formed by perpendicular lines
Square a rectangle with 4 equal sides, 4 right angles, and 4 vertices
Triangle a polygon with 3 sides, 3 angles, and 3 vertices
Vertex/vertices a corner or a point where lines meet
Volume the amount of space taken up by an object, usually calculated by V = b X h x w
Created by: lozuna