Plane Figures Triangles acuteangled triangle equilateral triangle isosceles

Plane Figures

Triangles acute-angled triangle equilateral triangle isosceles triangle obtuse-angled triangle isosceles rightangled triangle right-angled triangle

Quadrilaterals Square Rectangle Parallelogram Kite Rhombus Cyclic Quadrilateral Trapezium

Polygons Convex Polygon Concave Polygon

Polygons 3 Triangle 7 4 Quadrilateral 8 5 6 Pentagon Hexagon 9 10 Heptagon Octagon Nonagon Decagon 11 12 16 20 Hexadecagon Icosagon Hendecagon Dodecagon

Regular Polygons

3 -D Figures

3 -D Figures pyramid cuboid (prism) cube (prism) cylinder cone prism sphere hemisphere frustum

Regular Polyhedra Tetrahedron Cube Octahedron F=4 F=6 F=8 V=4 V=8 V=6 E = 12 Dodecahedron Icosahedron F = 12 F = 20 V = 12 E = 30

Circle

Centre, Radius, Circumference circumference Centre radius

Chord chord diameter

arc AB (minor arc) arc AXB (major arc) Arc semi-circle

Angle at Centre AOB is an angle at the centre subtended by the arc APB (or chord AB)

Angle at Circumference APB is an angle at the circumference subtended by the arc AB (or chord AB)

Sector semi-circle major sector AOB minor sector AOB

Segment semi-circle segment APB (major segment) segment AQB (minor segment)

Concyclic Points A B E C D A, B, C, D and E are concyclic

Cyclic Quadrilateral A D ABCD is a cyclic quadrilateral B C

Tangent secant tangent point of contact

Centres of a Triangle

Centroid median

Circumcentre Perpendicular bisector

Circumcentre circumscribed circle

Incentre angle bisector I

Incentre inscribed circle

Orthocentre altitude

Centres of a Triangle Centroid Incentre Median Angle Bisector Circumcentre Perpendicular Bisector Orthocentre Altitude