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Pythagorean Theorem (for right triangles only): a2 + b2 = c2. Sum of the Angles (all triangles): o. A + B + C = 180 iameter: Circle: D d = 2r. Circumference: C = 2 9. Right angles measure 90°. 10. Straight angle is an angle that measures 180°, a line. 180 Geometric terms are used to describe figures in space. Listed below are terms that help us communicate ideas and build concepts linking algebra and geometry.This PDF Learning Package is designed to be viewed in Acrobat. If you are using the In this section you will explore the geometry of angles. In particular, you Students should have learned about the properties of straight lines and angles in key stage 2, through the medium of Chinese. Time: 1 lesson (35 minutes). Page 2 360 o. 180 o. 3 Angle Geometry. 3.1 Measuring Angles. A protractor can be used to measure or draw angles. Note. The angle around a complete circle is is 360. angles formed when a line intersects two or more parallel lines at distinct points. Further you will use In the subsequent chapters of geometry, you will be using There are various Rules of angles that you should know. These can be used in any geometrical diagram to work out missing angles without the diagram having and relationships of the angles formed by parallel lines cut by a transversal, and apply the results to problems involving parallel lines. Angle Geometry.