Perimeter and Area - Summary
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Fundamentals of Geometry
Perimeter and Area 1. The perimeter of an object in a plane is the length of its boundary.
A circle's perimeter is called its circumference.
2. The area of an object is the amount of surface that the object occupies.
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Perimeter and Area - Summary
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Perimeter and Area Rectangles
Perimeter = l+ w+ l+ w = 2l + 2w
Area = length width =l?w
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Perimeter and Area Squares
Perimeter = l+l+l+l = 4l
Area = length width = l?l = l2
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Perimeter and Area Triangles
Perimeter = a+b+c
Area = ? b?h
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Perimeter and Area Parallelograms
Perimeter = l+ w+ l+ w = 2l + 2w
Area = length height = l?h
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Perimeter and Area Circles
Circumference(perimeter) = 2r = d
Area = r2
3.14159...
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Practice with Area and Perimeter Formulas
Find the circumference/perimeter and area for each figure described:
43/617 A circle with diameter 16 centimeters Circumference = d = ?16 cm= 16 cm Area = r2 = ?(16/2 cm)2 = 64 cm2
16
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Practice with Area and Perimeter Formulas
55/617 Find the perimeter and area of this triangle
Perimeter = 5+5+8 = 18 units Area = ? ?8?3 = 12 units2
5
5
3
8
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Surface Area and Volume
Ex. Consider a softball with a radius of 2 inches and a bowling ball with a
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