Formula/Reference sheets

Things that you should now about Geometry

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Formula/Reference sheets

The picture ^ are basic formulas you should know for areas of some shapes

Figure Formulas for Volume (V) and Surface Area (SA)

Rectangular Prism
  V = lwh = length x width x height
SA = 2lw + 2hw + 2lh
      = 2(length x width) + 2(height x width) + 2(length x height)

General Prisms   V = Bh = area of base x height
SA = sum of the areas of the faces

Right Circular Cylinder   V = Bh = area of base x height
SA = 2B + Ch = (2 x area of base) + (circumference x height)

Square Pyramid
v= 1/3Bh

SA= B+1/2P(slant height)

Right Circular Cone
V=1/3Bh

SA= B +1/2C(slant height)

Sphere
V=4/3Pi(r)cubed

Sa=4Pi(r)sq

below are some more formulas that you may need to know for your high school geometry class

Polygon Angle Formulas

Sum of degree measures of the interior angles of a polygon:

180 (n - 2)

Degree measure of an interior angle of a regular polygon:

180(n-2) divided by n

where n is the number of sides of the polygon

Distance Traveled

d = rt
distance = rate x time

Equations of a Line

Standard Form:

Ax + By = C

where A and B are not both zero

Slope-Intercept Form:

y = mx + b or y = b + mx

where m = slope and b = y-intercept

Point-Slope Formula:

y2-y1 divided by x2-x1=m

Coordinate Geometry Formulas

Let (x₁,y₁) and (x₂,y₂) be two points in the plane.

Midpoint= (x1+x2 divided by 2 , y1=y2 divided by 2)

Distance = the Sq root of (x2-x1)sq + (y2-y1)sq

Special Triangles