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7.1: Areas of Parallelograms and Triangles

7.1: Areas of Parallelograms and Triangles. Objective: To find the area of a parallelogram and to find the area of a triangle. . Area of a Rectangle:. A = bh b= base h= height. h. b. Area is always in squared units!! Please label!!. Area of a Parallelogram. A = bh b= base h= height.

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7.1: Areas of Parallelograms and Triangles

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  1. 7.1: Areas of Parallelograms and Triangles Objective: To find the area of a parallelogram and to find the area of a triangle.

  2. Area of a Rectangle: A =bh b= base h= height h b Area is always in squared units!! Please label!!

  3. Area of a Parallelogram A =bh b= base h= height

  4. Parallelogram BASE: Any of its sides ALTITUDE: Perpendicular segment to the line containing the base HEIGHT: Length of the altitude

  5. Examples • Find the area of a parallelogram with a base of 12 m and a height of 9 m. • If the area of a parallelogram is 72 ft2 and the height is 12 ft, what is the length of the base?

  6. Finding a missing dimension • Remember, base can be any side of the • Find the area using the known dimensions, then use that area to find the missing value. F FIND x. x D C 13 in 12 in B A 10 in.

  7. Area of a Triangle Base: Any of its sides Height: altitude length

  8. Examples • Find the area of a triangle with a base of 16in and a height of 10 in. • If the area of a triangle is 36 un2, and the base is 9 un, what is the height?

  9. Using the Coordinate Plane Find the area of EFGH with vertices E(-4, 3), F(0,3), G(1, -2) and H(-3,-2).

  10. Find the area of a triangle with vertices M(1,2), L(1,-5) and N(4,1).

  11. Find the area of the entire region. 6 ft 9 ft. 12 ft.

  12. Find the area of region A. 6 in. B A 3 in. 15 in.

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