Chapter 8 - Area

8.1 - Areas of Parallelograms and

Rectangles

Objective

• Students will derive through discovery and investigation area formulas for rectangles and parallelograms

Area of a Rectangle

The area of a rectangle is the product of its base and height.

A = bh

h

b

Area of a Parallelogram

The area of a parallelogram is the product of a base and the corresponding height.

A = bh h

b

The base of a parallelogram is any of its sides.

The corresponding altitude is a segment perpendicular to the line containing the base drawn to the side opposite the base.

The height is the length of the altitude.

h

bh

b

Find the area of the parallelogram.

a. 96m²b. 20m²c. 84m²

a. 120m²b. 150m²c. 180m²

Find the value of h in each parallelogram.

a. 4mb. 17.2m²c. 3.44m²

A diagonal divides any parallelogram into two congruent triangles.

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Journal Entry

Choose 1 Selection 2: Area is described as the space within a closed figure. Describe a time when you would use area formula in to solve a real life problem.

Selection 1:Words describe who you are as a person. When you think of yourself what are the first 5 words that come to mind?Explain how each words describes you.At least 5 sentences.