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 * Surface Area of a Cube = 6 a 2

Surface Area of a Rectangular Prism = 2ab + 2bc + 2ac

Surface Area of a Sphere = 4 //pi// r 2

Surface Area of a Cylinder = 2 //pi// r 2 + 2 //pi// r h **

**Tip! Don't forget the units.** These equations will give you correct answers if you keep the units straight. For example - to find the surface area of a cube with sides of 5 inches, the equation is: Surface Area = 6*(5 inches)2 = 6*(25 square inches) = 150 sq. inches

Area = Length X Width A = lw
 * **Shapes** || **Formula** ||
 * [[image:http://z.about.com/d/math/1/0/j/rectangle.gif width="153" height="77"]] || **Rectangle:**

Perimeter = 2 X Lengths + 2 X Widths P = 2l + 2w || Area = Base X Height a = bh || Area = 1/2 of the base X the height a = 1/2 bh Perimeter = a + b + c (add the length of the three sides) ||
 * [[image:http://z.about.com/d/math/1/0/m/parallelogram.gif width="149" height="64"]] || **Parallelogram**
 * [[image:http://z.about.com/d/math/1/0/e/triangle.gif width="140" height="74"]] || **Triangle**

Perimeter = area + b1 + b2 + c P = a + b1 + b2 + c || The distance around the circle is a circumference. The distance across the circle is the diameter (d). The radius (r) is the distance from the center to a point on the circle. (Pi = 3.14) More about [|circles.] d = 2r c = p d = 2 p r A = p r2 (p =3.14) || Volume = Length X Width X Height V = lwh Surface = 2lw + 2lh + 2wh || Volume = Base X Height v=bh Surface = 2b + Ph //(b is the area of the base P is the perimeter of the base)// || Volume = p r2 x height V = p r2 h Surface = 2 p radius x height S = 2 p rh + 2 p r2 || V = 1/3 bh b is the area of the base Surface Area: Add the area of the base to the sum of the areas of all of the triangular faces. The areas of the triangular faces will have different formulas for different shaped bases. || Volume = 1/3 pr2 x height V= 1/3 pr2h Surface = pr2 + prs S = pr2 + prs     = pr2 <span style="font-family: Geneva,Arial,Helvetica,san-serif;">+ p<span style="font-family: Verdana,Arial,Helvetica,sans-serif;">r        || Volume = 4/3 p r3 V = 4/3 p r3 Surface = 4 p r2 S = 4 p r2 || http://math.about.com/library/blmeasurement.htm
 * [[image:http://z.about.com/d/math/1/0/g/trapezoid.gif width="195" height="105"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Trapezoid**
 * [[image:http://z.about.com/d/math/1/0/q/circle.gif width="150" height="150"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Circle** [|Try the Online tool.]
 * [[image:http://z.about.com/d/math/1/0/i/rectangularsolid.gif width="173" height="114"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Rectangular Solid**
 * [[image:http://z.about.com/d/math/1/0/l/prisms.gif width="151" height="77"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Prisms**
 * [[image:http://z.about.com/d/math/1/0/n/cylinder.gif width="140" height="132"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Cylinder**
 * [[image:http://z.about.com/d/math/1/0/k/pyramid.gif width="130" height="133"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Pyramid**
 * [[image:http://z.about.com/d/math/1/0/o/cones.gif width="117" height="138"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Cones**
 * [[image:http://z.about.com/d/math/1/0/h/sphere.gif width="135" height="88"]] || <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**Sphere**