Math formulas

Area

S is the Area; π (pi) is a constant (approx 3.14159); R is the Radius; a is the length (or height), and b is the width (or breadth).

• Circle: S = πR²
• Rectangle: S = ab
• Square: S = a²

Perimeter

P is Perimetr; π (pi) is a constant (approx 3.14159); R is the Radius; is the length (or height), and b is the width (or breadth).

• Circle: P = 2πR
• Rectangle: P = 2a + 2b
• Square: P = 4a