Middle Measurement Unit Key Vocabulary

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Acute triangle - a triangle where all three angles are acute (less than 90°)

Area - the measure of the size of the surface of a two-dimensional figure; measured in square units

Base - side of a plane figure or face of a solid, particularly one perpendicular to the direction height is measured

Complex shape - a figure that includes the elements of two or more simple shapes (triangles, rectangles, squares, circles)

Cubic centimeter - the volume equal to a cube one centimeter on each side

Cubic foot - the volume equal to a cube one foot on each side

Cubic inch - the volume equal to a cube one inch on each side

Cubic unit - a unit of measurement of volume or capacity

Edge - a line segment joining two adjacent vertices in a two-dimensional figure or a shared boundary between two faces of a three-dimensional figure

Equilateral triangle - triangle in which all three sides are equal in length

Face - a flat surface of a three dimensional figure

Height - the perpendicular distance of a two- or three- dimensional shape from the base to the opposite vertex

Length - a measurement of the distance from one point to another

Net - a flattened three-dimensional figure that can be turned into a solid by folding it

Obtuse triangle - a triangle that has one internal angle greater than 90°

Quadrilateral - a polygon that has four sides

Parallel lines - two lines that lie in the same plane and maintain the same distance apart over their entire length, and never intersect

Rectangle - a quadrilateral (four-sided figure) with four right angles

Rectangular prism - a three-dimensional figure of which all faces are rectangles

Right angle - an angle of exactly 90°

Right triangle - a triangle containing an angle of 90°

Square - a rectangle with four congruent sides

Square foot - the area equal to a square one foot on each side

Square inch - the area equal to a square one inch on each side

Square meter - the area equal to a square one meter on each side

Square unit - a unit of measurement of area

Surface area - the total area of all the faces or surfaces of a three-dimensional figure

Trapezoid - a quadrilateral that has exactly one pair of parallel sides

Vertices - plural for vertex, the common point where two sides or edges meet

Volume - a measure of the number of cubic units needed to fill the space inside an object

Width - the minimum distance between parallel lines of a figure