Area and Perimeter

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Area and Perimeter
By Christine Berg Edited by V T Hamilton
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Perimeter

• The sum of the lengths of all sides of the
  figure

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Area

• The number of square units inside a figure

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Calculating Area
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Area

• Abbreviations
• A Area
• b base
• h height

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Rectangle

• To find the area multiply the length of the base
• times the height

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Rectangle

• A bh

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Parallelogram

• Draw a rectangle on graph paper. Cut off a
  triangle on one side and add it to the other.

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Parallelogram

• The rectangle becomes a parallelogram so the
  formula is the same as for a rectangle

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Triangle

• The area of a triangle is one half of the length
  of the base times the height

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Triangle
Area of the square is 4 times 4 or 16 sq.
in. Area of the triangle is one-half 16, or 8
sq.in. A 1/2 bh A 1/2 (4)(4) A 8 sq. in.

4in
4in