In construction, all you need is a compass and a ruler.
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Geometric figures can be drawn using a compass and a straight
edge. This is commonly known as ruler and compass construction.
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A geometrical construction can be made with with a straight edge
and a compass.
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by using a ruler and a compass
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Most often, a construction in math is when you are asked to
construct a geometric object, such as an equilateral triangle,
using tools such as a compass and a ruler.