![]() In particular, the mathematicianĮuclid documented it in his book titled "Elements", which is still regarded as an authoritative geometry reference. The Greeks formulated much of what we think of as geometry over 2000 years ago. If possible, turn the ruler over so you cannot see them. Since it is the most likely to be available, but you must not use the markings on the ruler during constructions. In most cases you will use a ruler for this, This plural reference is similar to the way we talk about scissors - with an 's' on the end.Ī straightedge is simply a guide for the pencil when drawing straight lines. The kind we are talking about here is usually referred to in the plural - compasses. A compass used to find the north direction is usually referred to in the singular - a compass. This kind of compass has nothing to do with the kind used find the north direction when you are lost. You can adjust the distance between the point and the pencil and that setting will remain until you change it. It has two legs, one with a point and the other with a pencil or lead. Protractor, or measure lengths with a ruler.Ĭompasses are a drawing instrument used for drawing circles and Very importantly, you are not allowed to measure angles with a The word construction in geometry has a very specific meaning: the drawing of geometric items such as lines and circles using only compasses and straightedge or ruler. No measurement of lengths or angles is allowed. Constructions: The drawing of various shapes using only a pair of compasses and straightedge or ruler.
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