# Category: geometry

- 3D geometry
- Angle at the centre of a circle is twice the angle at the circumference
- Angle in a semicircle is 90 degrees
- Angles in the same segment of a circle are equal
- Area and circumference of circles
- Area and perimeter
- Area and perimeter of quadrilaterals
- Area and perimeter of triangles
- Circle geometry
- Congruent and similar shapes
- Congruent shapes
- Congruent triangles
- Cube
- Cube surface area and net
- Decagons - polygons with 10 sides
- Dodecagons - polygons with 12 sides
- Geometry
- Geometry basic rules
- Hendecagons - polygons with 11 sides
- Heptagons - polygons with 7 sides
- Hexagons - polygons with 6 sides
- Interior and exterior angles of a polygon
- Line symmetry
- Loci
- Locus of points a fixed distance from a given line
- Locus of points a fixed distance from a given point
- Locus of points an equal distance between 2 lines
- Locus of points an equal distance between 2 points
- More quadrilaterals
- Nonagons - polygons with 9 sides
- Octagons - polygons with 8 sides
- Opposite angles in a cyclic quadrilateral add up to 180°
- Other types of polygon
- Parallel lines
- Parts of a circle
- Pentagons - polygons with 5 sides
- Perpendicular bisector of a chord
- Polygons
- Quadrilateral family tree
- Quadrilaterals
- Regular polygons
- Regular tessellations
- Rotational symmetry
- Similar shapes
- Similar triangles
- Similar triangles proof
- Star polygons
- Tangent and radius of a circle meet at 90°
- Tessellations and symmetry
- Transformations
- Translation
- Triangles
- Two radii form an isosceles triangle
- Two tangents from a point have equal length
- n-gons - polygons with any number of sides

## Join the GraphicMaths Newletter

Sign up using this form to receive an email when new content is added:

## Popular tags

adder adjacency matrix alu and gate angle area argand diagram binary maths cartesian equation chain rule chord circle cofactor combinations complex modulus complex polygon complex power complex root cosh cosine cosine rule cpu cube decagon demorgans law derivative determinant diagonal directrix dodecagon eigenvalue eigenvector ellipse equilateral triangle eulers formula exponent exponential exterior angle first principles flip-flop focus gabriels horn gradient graph hendecagon heptagon hexagon horizontal hyperbola hyperbolic function hyperbolic functions infinity integration by parts integration by substitution interior angle inverse hyperbolic function inverse matrix irregular polygon isosceles trapezium isosceles triangle kite koch curve l system line integral locus maclaurin series major axis matrix matrix algebra mean minor axis nand gate newton raphson method nonagon nor gate normal normal distribution not gate octagon or gate parabola parallelogram parametric equation pentagon perimeter permutations polar coordinates polynomial power probability probability distribution product rule pythagoras proof quadrilateral radians radius rectangle regular polygon rhombus root set set-reset flip-flop sine sine rule sinh sloping lines solving equations solving triangles square standard curves standard deviation star polygon statistics straight line graphs surface of revolution symmetry tangent tanh transformation transformations trapezium triangle turtle graphics variance vertical volume of revolution xnor gate xor gate