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- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/00%3A_Front_Matter
- https://math.libretexts.org/Courses/Rio_Hondo/NBAS022_-_Review_of_Geometry_Part_A/02%3A_Lines_Angles_and_Triangles/2.04%3A_Parallel_LinesTwo lines are parallel if they do not meet, no matter how far they are extended.
- https://math.libretexts.org/Courses/Nova_Scotia_Community_College/MATH_1043/07%3A_Geometry/7.03%3A_Triangle_CIassificationsA right triangle is a triangle with one right angle, The sides of the right angle are called the legs of the triangle and the remaining side is called the hypotenuse, This follows from the postulate t...A right triangle is a triangle with one right angle, The sides of the right angle are called the legs of the triangle and the remaining side is called the hypotenuse, This follows from the postulate that the shortest distance between two noints is along a straight line, For example, in Figure \(\PageIndex{7}\), the length \(AB\) (a straight line segment) must be less than the combined lengths of \(AC\) and \(CB\) (not on a straight line from \(A\) to \(B\)),
- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/07%3A_Regular_Polygons_and_Circles/7.04%3A_Degrees_in_an_ArcThe number of degrees in an arc is defined to be the number of degrees in the central angle that intercepts the arc.
- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/04%3A_Similar_Triangles/4.05%3A_Special_Right_TrianglesThere are two kinds of right triangle which deserve special attention: the 30°−60°−90° right triangle and the 45°−45°−90° right triangle.
- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/02%3A_Congruent_Triangles/2.06%3A_The_SSS_TheoremWe now consider the case where the side of two triangles are known to be of the same length.
- https://math.libretexts.org/Courses/Coalinga_College/Math_for_Educators_(MATH_010A_and_010B_CID120)/13%3A_Area_Pythagorean_Theorem_and_Volume/13.04%3A_Regular_PolygonsA regular polygon is a polygon in which all sides are equal and all angles are equal, Examples of a regular polygon are the equilateral triangle (3 sides), the square (4 sides), the regular pentagon (...A regular polygon is a polygon in which all sides are equal and all angles are equal, Examples of a regular polygon are the equilateral triangle (3 sides), the square (4 sides), the regular pentagon (5 sides), and the regular hexagon (6 sides).
- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/01%3A_Lines_Angles_and_Triangles/1.01%3A_LinesGeometry (from Greek words meaning earth-measure) originally developed as a means of surveying land areas, In its simplest form, it is a study of figures that can be drawn on a perfectly smooth flat s...Geometry (from Greek words meaning earth-measure) originally developed as a means of surveying land areas, In its simplest form, it is a study of figures that can be drawn on a perfectly smooth flat surface, or plane. It is this plane geometry which we will study in this bock and which serves as a foundation for trigonometry, solid and analytic geometry, and calculus.
- https://math.libretexts.org/Courses/Rio_Hondo/NBAS022_-_Review_of_Geometry_Part_A/02%3A_Lines_Angles_and_Triangles/2.06%3A_Triangle_CIassificationsA right triangle is a triangle with one right angle, The sides of the right angle are called the legs of the triangle and the remaining side is called the hypotenuse, This follows from the postulate t...A right triangle is a triangle with one right angle, The sides of the right angle are called the legs of the triangle and the remaining side is called the hypotenuse, This follows from the postulate that the shortest distance between two noints is along a straight line, For example, in Figure \(\PageIndex{7}\), the length \(AB\) (a straight line segment) must be less than the combined lengths of \(AC\) and \(CB\) (not on a straight line from \(A\) to \(B\)),
- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/02%3A_Congruent_TrianglesThumbnail: Diagram of two congruent triangles. \(\triangle\ ABC \cong\ \triangle\ DEF\) (CC BY-SA; Merovingian via Wikipedia)
- https://math.libretexts.org/Courses/Coalinga_College/Math_for_Educators_(MATH_010A_and_010B_CID120)/13%3A_Area_Pythagorean_Theorem_and_Volume/13.05%3A_CirclesThe circle is one of the most frequently encountered geometric figures. Wheels, rings, phonograph records, clocks, coins are just a few examples of common objects with circular shape. The circle has m...The circle is one of the most frequently encountered geometric figures. Wheels, rings, phonograph records, clocks, coins are just a few examples of common objects with circular shape. The circle has many applications in the construction of machinery and in architectural and ornamental design.
