plan, 2-D diagram that shows the view of a 3-D shape from above, front elevation, 2-D diagram that shows the view of a 3-D shape from the front, side elevation, 2-D diagram that shows the view of a 3-D shape from the side, dimensions, measurements, such as length, width and height, that describe the size and extent of an object, auxiliary line, line to show a change of depth, volume, amount of space a 3-D object takes up, measured in cubic units, radius, distance from the centre of the sphere to any point on its surface, diameter, distance between two opposite points on the surface of a sphere, passing through the centre, hemisphere, half of a sphere, cone, 3-D shape with a circular base and a curved surface that narrows to a single point (apex), pyramid, 3-D shape with a polygon base and triangular faces that meet at a point (apex), perpendicular height, measure of how tall a shape is, measured at a right angle from the base to a vertex, slant height, distance from one point on the circumference of the base of a cone to the apex, sphere, 3-D object where all points on the surface are equidistant from the centre, forming a perfectly round shape, surface area, area that covers the outside of a 3-D shape, calculated by finding the total area of all its surfaces, frustum, portion of a cone or pyramid remaining after its upper portion is removed following a cut off parallel to its base, similar shapes, shapes that have the same angle size in corresponding positions and proportional side lengths, meaning one is an enlargement of the other, metric, system of measurement based on units like metres, grams and litres, used to quantify length, mass and volume, unit, standard measurement used to express quantities

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