The Elements of Plane Geometry

AABC ABCD adjacent angles angle formed angles are equal apothem bisector bisects called central angle centre chord circumference circumscribed Conclusion construct a triangle Consult Prop decagon diagonals diameter draw drawn perpendicular equal circles equilateral triangle exterior angle Find the area find the length Find the locus find the number given circle given line given point given straight line given triangle homologous hypotenuse Hypothesis inches inscribed regular isosceles triangle legs line joining mean proportional median middle point number of degrees number of sides opposite sides parallel lines parallelogram perimeter perpendicular drawn point of contact point of intersection Problem produced Proof prove Q.E.D. Proposition quadrilateral radii radius ratio rectangle regular hexagon regular polygon rhombus right angle right triangle SCHOLIUM secant segments subtended tangent Theorem third side transversal trapezoid triangle ABC triangle is equal vertex vertical angle