Geometry & Trig Reference
Math formulas, definitions, properties, diagrams and examples from Geometry and Trigonometry
| Geometry Stuff | |
| Perimeters | Areas |
| Circle Stuff | |
| The Geometry of Circles: Definitions and formulas for the radius of a circle, the diameter of a circle, the circumference (perimeter) of a circle, the area of a circle, the chord of a circle, arc and the arc length of a circle, sector and the area of the sector of a circle |
The Trigonometry of Circles: Definitions and formulas for the arc and the arc length of a circle, sector and the area of the sector of a circle, the unit circle, the angles on the unit circle in radians, the angles on the unit circle in degrees, the points on the circumference of the unit circle |
| Triangle Stuff | |
| Notations: Geometry notations for triangles including the right triangle, congruent sides of a triangle and congruent angles of a triangle |
The Geometry of Triangles: Definitions and formulas for the area of a triangle, the sum of the angles of a triangle, the Pythagorean theorem, Pythagorean triples and special triangles (the 30-60-90 triangle and the 45-45-90 triangle) |
| Types of Triangles: Definitions and formulas for triangles including right triangles, equilateral triangles, isosceles triangles, scalene triangles, obtuse triangles and acute triangles |
The Trigonometry of Triangles: Definitions and formulas for basic trigonometry, sine, cosine, tangent, cosecant, secant, cotangent, the law of sines and the law of cosines |
| Quadrilateral Stuff: Definitions and formulas for perimeter and area, properties of sides and angles, diagrams |
|
| Squares | Rhombuses (Rhombi) |
| Rectangles | Kites |
| Parallelograms | Trapezoids |
| Properties of Polygons: Information on properties, interior angles and central angles |
||
| Triangles | Quadrilaterals | Pentagons |
| Hexagons | Heptagons | Octagons |
| Nonagons | Decagons | 11-gons |
| Dodecagons | ||