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https://mathopenref.com/constcopyangle.html How to copy an angle with compass and straightedge or ruler - Math Open Reference Given an angle formed by two lines with a common vertex, this page shows how to construct another angle from it that has the same angle measure using a compass... compass and straightedge how to copy angle ruler https://www.mathopenref.com/constperpendray.html How to construct (draw) a perpendicular at the end of a ray with compass and straightedge or ruler... This page shows how to cosntruct a perpendicular at the end of a ray with compass and straightedge or ruler. This construction works as a result of Thales... at the end compass and straightedge how to construct draw https://mathopenref.com/constaddangles.html How to add two angles with compass and straightedge or ruler - Math Open Reference Shows how to construct add one given angle to another using a compass and straightedge or ruler. A proof is shown. A Euclidean construction compass and straightedge how to two angles add ruler https://mathopenref.com/constsupplementaryangle.html Supplementary angle using compass and straightedge or ruler - Math Open Reference How to construct the supplementary angle to a given angle with compass and straightedge or ruler. A Euclidean construction. compass and straightedge supplementary angle using ruler math