Formula Review

Note: The ^ symbol is used to indicate power of.

Interest = Amount * Time * Rate

Discount = Cost x Rate of discount

x = 1/2a[-b +- (b^2)^1/2 - 4ac] (quadratic formula)

Distance = Speed x Time

a^2 + b^2 = c^2, where a and b are the lengths of the legs and c is the length of the hypotenuse of a right triangle (Pythagorean theorem)

Diameter of a circle = 2 x Radius

Area of a square = s^2

Area of a rectangle = lw

Area of a triangle = 1/2bh

Area of a circle = pi * r^2

Area of a parallelogram = bh

Area of a trapezoid = 1/2(b1 + b2)h

Circumference of a circle = pi d

Perimeter of a square = 4s

Perimeter of a rectangle = 2(l + w)

Distance between points (x, y) and (a, b) = ((x - a)^2 + (y - b)^2)^1/2

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