Section 10.1 – Area: Parallelograms pages 522 - 526.

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Section 10.1 – Area: Parallelograms pages

The area of a figure is the number of square units it encloses. The rectangle outlined in red encloses 8 square units, each with area 1 cm 2 (1 square centimeter). So, the area of the rectangle is 8 cm 2. You can use the formula A = bh to find the area of a rectangle, where b is the length of one side and h is the length of the other. For the rectangle above, A = 4 2 = 8. So, the area is 8 cm 2.

When you find area, the dimensions must be in the same unit. Example 1: Find the area of the marching band's rectangular banner. step 1: Change the units so that they are the same. step 2: Find the area. The area of the banner is 21 ft 2.

Check Understanding: a. Find the area of the rectangle. b. Find the area of the rectangle.

A rectangle is a special kind of parallelogram. The formula for the area of a parallelogram follows from the formula for the area of a rectangle. The height h of a parallelogram is the length of an altitude. An altitude is a line segment perpendicular to the line containing a base of the figure and drawn from the side opposite that base.altitude

Area of a Parallelogram The area of a parallelogram is the product of any base length b and the corresponding height h.

Example 2: Finding area of a parallelogram

Check Understanding a. Find the area of the parallelogram. b. Find the area of the parallelogram.

Homework pages #s 1-15, –DRAW DIAGRAMS and –write problems and answers, EXCEPT for word problems and multiple-choice problems –SHOW ALL WORK! –failure to write problems and/or show work will result in either receiving partial or no credit