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**Areas of Parallelograms & Triangles**

Tutorial 13b

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Parallelograms You can choose any side of a parallelogram to be a base. An altitude is any segment perpendicular to the line containing the base drawn from the side opposite the base. The height is the length of the altitude. height base

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**Area of a Parallelogram**

The area of a parallelogram is the product of any base and the corresponding height. A = bh h b

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**Area of a Parallelogram**

The area of a parallelogram is the product of any base and the corresponding height. A = bh A = 5•3 A= 15 3 5

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2. 4 12 8 4 A = bh A = 12•4 A = 48 units2 A = bh A = 4•8 A = 32 units2

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**A = bh A = 8•4 A = 32 Find the value of x in each parallelogram below.**

3. 4. 8 A = bh A = 8•4 A = 32 Use one set of base & height to find the area. After knowing the area, use the other base with the unknown height (x) and the area formula to solve for x. Click here to continue

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**Find the value of x in each parallelogram below.**

3. 4. 5 8 x A = bh A = 8•4 A = 32 Use one set of base & height to find the area. After knowing the area, use the other base with the unknown height (x) and the area formula to solve for x. 32= bh 32= 5x = x

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**Find the value of x in each parallelogram below.**

3. 4. 5 8 x A = bh A = 8•4 A = 32 Try #4 on your own, then click below to check your answers. Check Answer 32= bh 32= 5x = x

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**A = bh A = bh A = 8•4 A = 19•11 A = 32 A = 209 209= bh 209= 12x = x**

Find the value of x in each parallelogram below. 3. 4. 5 8 x A = bh A = 8•4 A = 32 A = bh A = 19•11 A = 209 209= bh 209= 12x = x 32= bh 32= 5x = x

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**Triangles You can choose any side of a triangle to be the base.**

The corresponding height is the length of an altitude drawn to the line containing the base. height base

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Area of a Triangle The area of a triangle is half the product of any base and the corresponding height. h b

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**Example #1 A = 1/2 •20•6 A = 60 ft2 Find the area of this triangle**

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The End Time to move on to the assignment or the next lesson

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