Chapter Seven:  
Area

Geometry   Notes

Chapter  7

Section  7.1
Section  7.2
Section  7.3
Section  7.4
Section  7.5
Section  7.6
Section  7.7
Section  7.8


Geometry Contents

Take notes on the following topics.

Section 7-1  Areas of Parallelograms and Triangles

Parallelogram (p. 349) A parallelogram is a quadrilateral with two pairs of parallel sides. You can choose any side to be the 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 an altitude.

Triangle (p. 350) A triangle is a polygon with three sides. You can choose any side to be a base. Then the height is the length of the altitude drawn to the line containing that base.

 

Theorem 7.1 (Area of a Rectangle)

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

Theorem 7-2 (Area of a Parallelogram)

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

Theorem 7-3 (Area of a Triangle)

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