## GED Test Mathematics Formula Sheet

Area of a:

 Parallelogram $$A = bh$$ Trapezoid $$A =\frac{1}{2}h(b_1+ b_2)$$

Surface Area and Volume of a:

 Rectangular/Right Prism $$SA = ph + 2B$$ $$V = Bh$$ Cylinder $$SA = 2 \pi rh + 2 \pi r^2$$ $$V = \pi r^2h$$ Pyramid $$SA = \frac{1}{2} ps + B$$ $$V =\frac{1}{3}Bh$$ Cone $$SA = \pi r + \pi r^2$$ $$V =\frac{1}{3} \pi r^2 h$$ Sphere $$SA = 4 \pi r^2$$ $$V =\frac{4}{3} \pi r^3$$ $$p =$$  perimeter of base $$B; \pi = 3.14$$

Algebra:

 Slope of a line $$m = \frac{(Y_2 - Y_1)}{(X_2 - X_1)}$$ Slope-intercept form of the equation of a line $$y =mx + b$$ Point-slope form of the Equation of a line $$y - y_1 = m(x - x_1)$$ Standard form of a Quadratic equation $$y = ax^2 + bx +c$$ Quadratic formula $$x={-b\pm\sqrt{b^2-4ac}\over 2a}$$ Simple interest $$I = Prt$$ (I = interest, p = principal, r = rate, t = time)

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