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

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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 b h Area is always in squared units!! Please label!!

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

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

Examples 1.Find the area of a parallelogram with a base of 12 m and a height of 9 m. 2.If the area of a parallelogram is 72 ft 2 and the height is 12 ft, what is the length of the base?

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. A B CD F 10 in. 13 in 12 in x FIND x.

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

Examples 1.Find the area of a triangle with a base of 16in and a height of 10 in. 2.If the area of a triangle is 36 un 2, and the base is 9 un, what is the height?

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

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

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

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