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

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

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

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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)

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

A = L x W

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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

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

A = L x L or
A = L^{2}

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

P = a + b + c

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

A = A =

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Calculate the __Circumference____ __of a **Circle**: distance around the circle** **(the “perimeter” of the circle)

C = 2r or C = d

(r
is radius) (d is
diameter)

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

A = r^{2 } A = x r x r

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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)