Mensuration

Sine Rule

Cosine Rule

a² = b² + c² + 2bc cos A

b² = a² + c² - 2ac cos B

c² = a²+ b² - 2ab cos C

Rectangle  

Area of Rectangle

Square

Area of Square

Trapezium

Area of Trapezium

Parallelogram

Area of Parallelogram

Rhombus

Quadrilateral

Area of quadrilateral = ½ (AC) (h₁ + h₂)

where h₁ and h₂ are the altitudes on BC from D and A.

Triangle

Area of Triangle

Circle and Sector of a Circle

Segment of a Circle 

Ring (Shaded region)

Polygon