This document provides definitions and formulas for common geometric shapes. It defines perimeter as the distance around a closed figure and gives the formula for the perimeter of a rectangle as P = 2l + 2w. It lists area formulas for rectangles, parallelograms, triangles, and trapezoids. It also mentions the Pythagorean theorem and formulas for converting between Fahrenheit and Celsius and calculating distance between two points using the distance formula, which is related to the Pythagorean theorem. It concludes with practice problems for lessons 8 and 9.

1. Formulas in Geometry
Lessons 8 and 9

2. Definitions
•A formula is a mathematical relationship expressed
with symbols. Some formulas have already been
encountered in algebra.
•The perimeter is the sum of the side lengths of a
closed geometric figure. It is often thought of as the
formulas used in other distance around a figure.
•The formula for the perimeter (P) of a rectangle,
with length ℓ and width w is: P = 2l + 2w

3. Common Area Formulas
•Rectangle A = bh
•Parallelogram A = bh
•Triangle A = 1/2bh
•Trapezoid A = 1/2h(b1 + b2)

4. Pythagorean Theorem

5. Temperature Formulas
Formula to convert a temperature
in Fahrenheit (F) to Celsius (C)

6. Distance Formulas
How is the distance formula related to the
Pythagorean Theorem?

7. The formula for the Distance between the points (x1,
y1) and (x2, y2) is:

8. Lesson Practice Problems
Lesson 8: p. 50 a - h
Lesson 9: p. 55 a - d