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an angle for which you can determine the trigonometrical ratio without the use of a calculator.
a pyramid with its vertex directly above the centre of its square base.
a closed plane figure bounded by three or more straight lines.
the highest or lowest point on a parabola, depending on whether the graph is ∩-shaped or ∪-...
a decimal fraction that has a fixed and finite number of decimal places.
the point or points at which a graph cuts or intersects the x-axis.