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Lines and angles. A line is an infinite number of points between two end points. Where two lines meet or cross, they form an angle. An angle is an amount of rotation. It is measured in degrees. Types of angles. Name of angle. Example.
Interior Angles Theorem If two lines are intersected by a transversal and same-side interior angles are supplementary, then the lines are parallel Theorem If two intersecting lines form a linear pair of congruent angles, then the lines are perpendicular Theorem If two lines are perpendicular to the same transversal, then they are parallel
definitions, explanations and examples for elementary and advanced math topics. Mathguy.us – Developed specifically for math students from Middle School to College, based on the author's extensive experience in professional mathematics in a business setting and in math
The angles that lie inside a shape, generally, a polygon, are said to be interior angles, or the angles that lie in the area enclosed between two parallel lines that are intersected by a transversal are also called interior angles. Learn more about interior angles in this article.
interior angles of a triangle is 180 o. Corollary: The acute angles of a right triangle are complementary. 4.2 Exterior Angle Theorem: The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles. 4.3 Third Angles Theorem: If two angles of one triangle are
interior angle is formed by two sides of a triangle. An exterior angle is formed by one side of the triangle and extension of an adjacent side. 4 is an exterior angle. 3 is an interior angle. Each exterior angle has two remote interior angles.
Deductive geometry is the art of deriving new geometric facts from previously-known facts by using logical reasoning. In elementary school, many geometric facts are introduced by folding, cutting, or measuring exercises, not by logical deduction.
