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Year 9 Measurement

Definitions and Facts from the NSW Year 9 Measurement Topic

Dimensions The length, breadth and height of plane figures or solids
Two-dimensional Flat, or having only two dimensions (length and breadth, but no height).
Perimeter The distance around a shape, or the total length of a shape’s boundary.
Circumference The perimeter of a circle.
Area The amount of surface covered by an object.
Composite shape A plane shape made up of simpler geometric shapes.
Perpendicular height The height measured perpendicularly from the base to the vertex at the top. That is, creating an angle of 90 degrees with the base.
Capacity The amount a container can hol
Volume The amount of space taken up by an object or substance, measured in cubic units.
Net A flat shape that can be folded up into a solid.
Prism A 3D (three-dimensional) object with two facing ends or bases (polygons) that are the same size and the same shape (ie they are congruent). All its other faces are rectangular.
Radius The distance from the centre of the circle to the circumference of the circle.
Diameter An interval across a circle through the centre (twice the radius).
Created by: wdobson