Related Terms: Altitude of a triangle, Perpendicular, Angle bisector, Right triangle, Corresponding angles, Cotangent, Hypotenuse, Rectangle, Tangent, Diagonal, Apothem, Alternate interior angles, Regular polygon, Cosine, Subtend, Convex polygon, Rectangular, Perpendicular lines, Hexagonal, Decagon, Right angle, Vertical angles, Rhomboid, Rhombus, Sine, Adjacent angles, Square, Quadrilateral, Obtuse triangle, Cyclic quadrilateral, Straight angle, Polygon , Dihedral angle, Skew, Inscribed angle, Tetragonal, Isosceles trapezoid, Pentagon, Equilateral triangle, Hexagon, Triangle, Orthogonal, Heptagon, Leg, Trigonometric functions, Scalene triangle, Central angle, Octahedron, Kite , Concave polygon