Chapter 1: Tools of Geometry

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Presentation transcript:

Chapter 1: Tools of Geometry 1-9 Perimeter, Circumference, and Area

Perimeter the distance around an object the only weird one: circles use the circumference formula

Area square: rectangle: circle:

Postulates 1-9: if two figures are congruent, then their areas are equal 1-10: the area of a region is the sum of the areas of its nonoverlapping parts

Example 1 Your pool is 15 ft wide and 20 ft long with a 3-ft wide deck surrounding it. You want to build a fence around the deck. How much fencing will you need? Fence P= 20Ft 3ft 15ft

Example 2 Find the circumference of the circle in terms of π. Then find the circumference to the nearest tenth.

Example 3 Find the perimeter of triangle ABC. A(-1,-2), B(5,-2), and C(5,6).

Example 5 The diameter of a circle is 10 in. Find the area in terms of π.

Example 6 What is the area of the figure?

Homework!! p. 65-67 2-16 even, 25, 27, 29 34, 37