Plane Geometry

AB² ABCD acute angle adjacent angles altitude apothem base bisects chord circumference coincide Constr construct a square Construct a triangle denoted diagonal diameter divided draw a line equal angles equal circles equiangular polygon equidistant equilateral triangle EXERCISES exterior angle figure Find the area given angle given circle given line given point given straight line given triangle greater Hence homologous sides hypotenuse inscribed angle inscribed polygon intersect isosceles trapezoid isosceles triangle LAOB Let the pupil line drawn median method number of sides parallel lines parallelogram perimeter plane PROBLEM produced Prop prove Proof pupil supply Q. E. D. Ex Q. E. D. PROPOSITION quadrilateral radii ratio rectangle reflex angle regular inscribed regular polygon rhombus right angle right triangle secant segments symmetry tangent THEOREM third side trapezoid triangle ABC vertex angle vertices