4.3 Triangles What are your objectives for Section 4.3? How can you accomplish each objective? 1 Find the Perimeter and Area of a Triangle • Write the defi nition of a triangle in your own words, draw an example, and note its main characteristics. • Know how to fi nd the perimeter of a triangle. • Write the formula for fi nding the Area of a Triangle in your notes. • Complete the given examples on your own. • Complete You Trys 1–3. 2 Find Angle Measures in a Triangle • Write the property for the Sum of the Angle Measures in a Triangle in your notes. • Complete the given example on your own. • Complete You Try 4. 3 Classify Triangles • Learn how to classify triangles by their angles: acute triangle, right triangle, and obtuse triangle. • Learn how to classify triangles by their sides: equilateral triangle, isosceles triangle, and scalene triangle. • Complete the given examples on your own. • Complete You Trys 5 and 6. Read the explanations, follow the examples, take notes, and complete the You Trys. In this section, we will learn about triangles. 1 Find the Perimeter and Area of a Triangle Definition A triangle is a closed fi gure with exactly three sides. Example: As with other fi gures, the perimeter of a triangle is the distance around the triangle. To fi nd the perimeter, we add the lengths of the three sides. 308 CHAPTER 4 Basic Geometry Concepts and Algebra www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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