Plane Geometry

ABCD acute angle adjacent angles altitude angle formed angles are equal angles equal apothem base bisects central angle circumcircle Corollary corresponding sides diagonals diameter Draw drawn equal angles equal circles equal respectively equal sides equiangular equilateral triangle EXERCISES GROUP exterior angle feet figure Find the area Find the length Find the number geometry given circle given line segment given point hypotenuse inscribed angle interior intersecting isosceles triangle joining the midpoints Known methods line segment joining locus of points median methods of proving number of degrees number of sides opposite sides parallelogram perimeter perpendicular bisector points equidistant possible Post Proposition quadrilateral radii radius ratio rectangle regular polygon rhombus right angle right triangle secant Selection of Method STATEMENTS REASONS straight line tangent Theorem transversal trapezoid triangle are equal triangles are congruent vertex angle vertices