Logical Sequence in Plane Geometry

ABCD Additional Theorems adjacent angles Alternate angles alternate segment angles are equal angles are supplementary angles marked bisect Centroid chord circle are equal CIRCLES AND ANGLES Circum-centre concyclic congruent triangles CONSTRUCTIONS not essential converse corresponding angles corresponding sides deduced diagonals equal in area equal to four exterior angle finite straight line fixed points four right angles greater side hypotenuse In-centre included angle interior angle increases intersecting straight lines interval joining logical sequence MEANS OF IDEOGRAMS minimum number necessary yet sufficient number of units opposite angles opposite sides opposite the greater Orthocentre parallel sides parallel straight lines parallelogram perpendicular bisector PLANE GEOMETRY points thus determined polygon precise and concise precise definition proof Proportional-Division Theorem Pythagoras quadrilateral RAPID REVISION ratio Rectilineal figures rhombus SEQUENCE IN PLANE similar square straight line subtends straight lines cut straight lines intersect subtends a right tangent interval THEOREMS AND CONSTRUCTIONS transversal trapezium triangle are unequal triangle cut vertex