Plane Geometry

ABC and A'B'C acute angle adjacent angles altitude angles are equal arc A'B base bisects called central angle chord circumference circumscribed congruent construct Corollary curve diagonal diameter distance divide drawn equal angles equilateral triangle exact number exterior figure Find the area Find the length Geometry given angle given circle given line given point HINT hypotenuse included angle interior angles intersection isosceles triangle line joining locus mean proportional measured median middle point number of sides obtuse angle Outline of proof parallel lines parallelogram perimeter perpendicular bisector polygon ABCDE portions Problem protractor prove quadrilateral radii radius ratio rectangle regular hexagon regular inscribed regular polygon revolutions per minute rhombus right angle right triangle ruler and compasses secant segment side opposite straight angle straight line subtends tangent Theorem VII transversal trapezoid triangle ABC unit vertex vertices