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# 2D –geometric shape: square, rectangle, triangle, circle, trapezoid, parallelogram, etc.

¨        2D –geometric shape:  square, rectangle, triangle, circle, trapezoid, parallelogram, etc.

¨        composite figure:  a combination of 2 or more geometric shapes     e.g.                              e.g.

¨        3D –geometric shape:  rectangular prism,    triangular prism,    cylinder,    cone,    sphere,     pyramid,   etc.

¨        Calculate the Perimeter of a Rectangle:   distance around the rectangle (add up the lengths of all 4 sides)

P = L + L + W + W        or         P = 2L + 2W       or        P = 2(L + W)

¨        Calculate the Area of a Rectangle:   number of square units that it covers (multiply length x width)

A = L x W

¨        Calculate the Perimeter of a Square:   distance around the square (add up length of all 4 sides)

P = L + L + L + L        or         P = 4L

¨        Calculate the Area of a Square:   number of square units that it covers (multiply length x length)

A = L x L        or       A = L2

¨        Calculate the Perimeter of a Triangle:   distance around the triangle (add up the lengths of all 3 sides)

P = a + b + c

¨        Calculate the Area of a Triangle:   number of square units that it covers ( ½  x base of triangle x height of triangle)

A =            A =

¨        Calculate the Circumference of a Circle:   distance around the circle  (the “perimeter” of the circle)

 r

C = 2r                      or                                C = d

(r  is  radius)                                         (d  is  diameter)

¨        Calculate the Area of a Circle:   number of square units that it covers (  x  radius  x  radius)

A = r2           A =  x r x r

¨        Calculate the Surface Area of a Rectangular Prism:  add up the areas of all 6 sides of the prism

SA = (2 x L x W )+ (2 x L x H) + (2 x W x H)

or  SA = 2(LW + LH + WH)

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