Formula Surface Area of a Rectangular Solid The surface area, SA, of a rectangular solid with length l, width w, and height h is SA 2lw 2lh 2wh Because we are fi nding the total area on the surface of the object, surface area is measured in square units. Find the surface area of the box of macaroni and cheese. Solution Identify l, w, and h: l 9 cm, w 3 cm, and h 18 cm. SA 2lw 2lh 2wh SA 2(9 cm)(3 cm) 2(9 cm)(18 cm) 2(3 cm)(18 cm) Substitute the values. SA 54 cm2 324 cm2 108 cm2 Multiply. S A 486 cm2 Add. ANSWERS TO YOU TRY EXERCISES 1) a) 477 4 ft3 or 119 1 4 ft3 b) 125 m3 2) 20 m3 3) 52 ft2 EXAMPLE 3 18 cm 3 cm 9 cm YOU TRY 3 Find the surface area of the box. 4 ft 2 ft 3 ft 4.4 Exercises Do the exercises, and check your work. Objective 1: Find the Volume of a Rectangular Solid 1) Write the formula that represents the volume of a rectangular solid with length l, width w, and height h. 2) When can you call a rectangular solid a cube? Find the volume of each rectangular solid. 3) 8 cm 3 cm 3 cm www.mhhe.com/messersmith SECTION 4.4 Volume and Surface Area 323
messersmith_power_prealgebra_1e_ch4_7_10
To see the actual publication please follow the link above