Area is the amount of space inside a 2D shape. Common shapes: Rectangle, Square, Triangle, Circle, Trapezium, Parallelogram. Used in SSC CGL, IBPS PO and all competitive exams.
Key Formulas
Rectangle
Area = Length × Breadth, Perimeter = 2(L+B)
Most common shape.
Circle
Area = πr², Circumference = 2πr
π=22/7 or 3.14.
Triangle
Area = (1/2)×base×height
Heron's formula for all sides given.
Square
Area = side², Perimeter = 4×side, Diagonal = side√2