CHAPTER Surface Area - School District #35

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Name: _____________________________________________________ Date: ______________ Three-Dimensional Objects 3-dimensional (3-D) ● an object that has length, width, and height ● you can describe a 3-D object by its faces, edges, and vertices face–flat or curved surface edge–line segment where 2 faces meet vertex–point where 3 or more edges meet 1. Write the name and the number of edges, faces, and vertices for each object. Object Name Faces Edges Vertices Circles radius ● the distance from the centre of the circle to the outside edge ● r shows the radius ● the radius is half the diameter: r = d ÷ 2 or r = d 2 diameter ● the distance across a circle through its centre ● d shows the diameter ● the diameter is twice the radius: d = 2 × r or circumference ● the distance around a circle (the perimeter) ● C shows the circumference ● C = 2 × π × r or C = π × d area d = 2r π is about 3.14 ● the number of square units needed to cover a 2-dimensional shape ● A shows the area r 2 means r × r ● A = π × r 2 2 or A = πr C d r 226 MHR ● Chapter 5: Surface Area
Name: _____________________________________________________ Date: ______________ 2. Find the circumference of each circle to the nearest tenth (1 decimal place). a) 6 cm b) 2 cm C = π × d C = 2 × π × r = 3.14 × = 2 × × = cm = 3. Find the area of each circle to the nearest tenth (1 decimal place). a) 2 cm A = π × r 2 A = π × r × r b) = × × 5 cm Area Formulas h w Area of a rectangle = l × w l Area of a triangle = b × h ÷ 2 b b Area of a parallelogram = b × h h 4. Find the area of each shape. Area is measured in square units. a) 6 cm b) h = 5.5 cm 9 cm b = 10 cm A = b × h ÷ 2 = × ÷ 2 A = b × h = × = = Get Ready ● MHR 227
Page 1: CHAPTER 5 Surface Area GET READY 22
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5.2 Warm Up, page 238 1. a) top fro
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CHAPTER Surface Area - School District #35

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