The Teaching of Mathematics in Secondary Schools

absolutely adjacent angles algebra altitude analysis annexed diagram applications axioms beginner bisector bisects Chapter circle Commutative Law concrete consider construct definition demonstrations difficult draw elementary elementary algebra equal triangles equations Euclid's postulate exact examples exercises factoring facts formula functions geometry give Hence illustrations induction isosceles triangle knowledge large number laws lead locus logical mathe mathematical teaching matical matter means memorizing mental method multiplication numerical values oblique projection obtain original pair parallel parallelogram pedagogic perpendicular plane plane geometry polygon practical preceding preliminary propositions problems proof prove pseudosphere pupil quadrilateral quadrilateral ABCD rational reasoning reflex angle relating right angles right triangle rigor roots secondary school sides similar simple solid geometry solution solve straight angles straight line student symbols teacher textbooks theorem tion topics trigonometry true usually vertical angles