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Surface Area of a cube
6a² (made up of 6 squares; hence 6a² (a²= one square)
Area of a circle
πr²
Circumference of a circle
2πr
Distance formula
(derived from pythagorean theorem)
d = √((x₂ − x₁)² + (y₂ − y₁)²)

Area of an equilateral triangle
(sqrt3 /4)s²
