Chapter 1

Chapter 1 Basics of Geometry Section 7 Introduction to Perimeter, Circumference, and Area

GOAL 1: Reviewing Perimeter, Circumference, and Area Formulas for the perimeter P, area A, and circumference C of some common plane figures are given below. Note: Dont

forget area has square units!! Example 1: Finding the Perimeter and Area of a Rectangle Find the perimeter and area of a rectangle of length 12 inches and

width 5 inches. Example 2: Finding the Area and Circumference of a Circle Find the diameter, radius, circumference, and area of the circle shown at the right. Use 3.14 as an approximation for .

Example 3: Finding Measurements of a Triangle in a Coordinate Plane Find the area and perimeter of the triangle defined by D(1, 3), E(8, 3) and F(4, 7). GOAL 2: Using a Problem-Solving Plan

A problem-solving plan can help you organize solutions to geometry problems. 1) Ask yourself what you need to solve the problem. Write a verbal model or draw a sketch that will help you find what you need to know. 2) Label known and unknown facts on or near your sketch. 3) Use labels and facts to choose related definition, theorems, formulas, or other results you may need.

4) Reason logically to link the facts, using a proof or other written argument. 5) Write a conclusion that answers the original problem. Check that your reasoning is correct. Example 4: Using the Area of a Rectangle You have a part-time job at a school. You need to buy enough grass seed to

cover the schools soccer field. The field is 50 yards wide and 100 yards long. The instructions on the seed bags say that one bag will cover 5000 square feet. How many bags do you need? Example 5: Using the Area of a Square You are planning a deck along two sides of a pool. The pool measures 18 feet by

12 feet. The deck is to be 8 feet wide. What is the area of the deck? Example 6: Using the Area of a Triangle You are making a triangular flag with a base of 24 inches and an area of 360 square inches. How long should it be?

Recently Viewed Presentations

  • Solutions


    Solubility "Like Dissolves Like" a given solvent can dissolve solutes that have similar polarities. Polar dissolves in polar (So things like water dissolve get pulled apart)
  • African Penguin - Weebly

    African Penguin - Weebly

    The African Penguin species were first recognised as 'endangered' in 2010 and have declined immensely since the first full census in 1956. During this census a total of 150,000 breeding pairs were estimated but recent census' estimate that only 25,000...
  • The Renaissance, 1400-1500

    The Renaissance, 1400-1500

    The End of the Medieval Era. Plague, 1348. Loss of up to one-half the population. Alters dynamics of feudal system. More land meant less reliance on the upper class to provide for the peasants
  • Folie 1 -

    Folie 1 -

    Purpose The components of the atmospheric water cycle (water vapour, precipitation and evapotranspiration), which are relevant for the climate system, are insufficiently known.
  • Blank A1 poster -

    Blank A1 poster -

    BU & BPC Collaborative Research Reference Cutts S., Davies P., Newell D. & Rowe N. 2009 Requirements for an Adaptive Multimedia Presentation System with Contextual Supplemental Support Media. In: Proceedings of 2009 First International Conference on Advances in Multimedia (MMedia...
  • COMP 481 John Greiner

    COMP 481 John Greiner

    Items and Itemsets An itemset is merely a set of items In LR parsing terminology an item Looks like a production with a '.' in it The '.' indicates how far the parse has gone in recognizing a string that...
  • Microscopy History of the Microscope Hans and Zacharias

    Microscopy History of the Microscope Hans and Zacharias

    Microscope should be stored with scanning objective clicked into place. Plug in your microscope. Use the coarse knob to focus and the fine adjustment until object is clear. Once focused, switch to low power and use the coarse knob to...
  • Algebra II Schoolnet Benchmark - Huntsville City Schools

    Algebra II Schoolnet Benchmark - Huntsville City Schools

    Schoolnet Benchmark Assessments and Alabama College and Career Readiness Standards. January 16, 2014. Algebra II Schoolnet Benchmark. Algebra II Teacher ExamAlgebra I standard 22 Pages - 40 Questions.