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# 10.4 surface area of prisms & cylinders 3

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### 10.4 surface area of prisms & cylinders 3

1. 1. Lesson 10.4, For use with pages 542-547Identify the solid.1.2. Count the number of faces, edges, and vertices for the figure.
2. 2. Lesson 10.4, For use with pages 542-547Identify the solid.1.ANSWER pentagonal pyramid2. Count the number of faces, edges, and vertices for the figure.ANSWER 6 faces; 10 edges; 6 vertices
3. 3. Surface Area of Prisms & Cylinders Section 10.4 P. 542
4. 4. Find the surface area.• What measurement is missing?• How can you find it?c2 = a2 + b2c2 = 32 + 42c2 = 9 + 16c2 = 25c = 5 inches
5. 5. Base: A = b x h ÷ 2 (3x4) ÷ 2= 6 Left: A = b x h5 in 2x3=6 Right: A = b x h 2x4=8 Front: A = b x h 2 x 5 = 10 6 + 6 + 6 + 8 +10 = 36 ft s q.
6. 6. EXAMPLE 4 Finding the Surface Area of a Cylinder Find the SA Find the surface area of the can of sloppy joe sauce.Circle: A = π r2A= 3.14 x 4 x 4= 50.24C=πxdC= 3.14 x 8 = 25.12Rectangle: A = b x hA= 25.12 x 10.7 = 268.784Surface area: 50.24 +50.24 +268.784 =369.3 cm2
7. 7. EXAMPLE 2 Using a Net to Find Surface AreaStorage ChestYou are painting a storage chest with the givendimensions. Find the surface area to be painted. Front: 30 x 15 = 450 Side: 15 x 15 = 225 Top: 30 x 15 = 450 450+450+225+ 225+450+450= 2250 in sq.
8. 8. Homework Worksheet 10.4  Problems: 1-4, 8-9