School Improvement in Maryland
Geometry - Instructional Strategies
ShapeFormulas for Area (A) and Circumference (C)
Triangle .A = bh = x base x height
Rectangle .A = lw = length x width
Trapezoid .A = (b1 + b2)h = x sum of bases x height
Parallelogram .A = bh = base x height
Circle  . .

FigureFormulas 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 . equation
Right Circular Cone . equation
Sphere . equation

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:


Coordinate Geometry Formulas

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




Distance Traveled
d = rt
distance = rate x time
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:


where n is the number of sides of the polygon

Simple Interest
I = prt

interest = principal x interest rate x time

Formulas for Right Triangles
.formula for right triangles
Special Triangles
.formula for special triangles
Instructional Strategies