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Areas of Parallelograms. Lesson 10-3. Parallelogram. A parallelogram is a quadrilateral where the opposite sides are congruent and parallel. A rectangle is a type of parallelogram, but we often see parallelograms that are not rectangles (parallelograms without right angles).

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Presentation Transcript
parallelogram
Parallelogram
  • A parallelogram is a quadrilateral where the opposite sides are congruent and parallel.
  • A rectangle is a type of parallelogram, but we often see parallelograms that are not rectangles (parallelograms without right angles).
area of a parallelogram
Area of a Parallelogram
  • Any side of a parallelogram can be considered a base. The height of a parallelogram is the perpendicular distance between opposite bases.
  • The area formula is A=bh

A=bh

A=5(3)

A=15m2

complex figures
Complex Figures
  • Use the appropriate formula to find the area of each piece.
  • Add the areas together for the total area.
example
Example

24 cm

10 cm

| 27 cm |

Split the shape into a rectangle and triangle.

The rectangle is 24cm long and 10 cm wide.

The triangle has a base of 3 cm and a height of 10 cm.

solution
Solution

Rectangle

Triangle

A = ½ bh

A = lw

A = ½ (3)(10)

A = 24(10)

A = 240 cm2

A = ½ (30)

A = 15 cm2

Total Figure

A = A1 + A2

A = 240 + 15 = 255 cm2

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