We can also classify triangles by the lengths of their sides. When the sides of triangles are the same length, we mark them with a hash mark like this: 0 Note An equilateral triangle has three sides of equal length. An isosceles triangle has two sides of equal length. A scalene triangle has no sides of equal length. ANSWERS TO YOU TRY EXERCISES 1) a) area 9 25 ft2; perimeter 12 5 ft or 2 2 5 ft b) area 136 cm2; perimeter 54 cm 2) V 2772 in3; SA 1264 in2 3) a) obtuse b) acute c) right Putting It All Together Exercises Do the exercises, and check your work. Objective 1: Review the Concepts of Sections 4.1–4.4 Identify each fi gure as a line, a line segment, or a ray. Then, name it using the correct notation. 1) T R 2) A B 3) P N ¡ 4) Draw a ray named CK . Classify each angle as acute, right, obtuse, or straight, and name each angle. 5) B C A 6) H 7) V 8) X Y Z · 9) Draw lines AB · and CD so that they are parallel. · 10) Draw lines MN · and XY so that they are perpendicular. 11) Write the formulas for the area, A, and perimeter, P, of a rectangle with length l and width w. 12) Write the formula for the area, A, of the triangle with height h and base of length b. Find the area and perimeter of each fi gure. 13) 12 cm 5 cm 13 cm 14) 5 yd 8 1 1 yd 2 15) 1 ft 4 1 ft 4 330 CHAPTER 4 Basic Geometry Concepts and Algebra www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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