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# Surface area of Cylinders and HW

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• 1. Surface Area of CylindersUnroll a cylinder to see what shapes makeup a cylinder.
• 2. You have to find the area of the rectangle and thetwo circles.Given the radius of the circle and the height of thecylinder, how are you going to be able to dothat?Area of the circles (bases) = 2πr²Area of the lateral rectangle = lw = (height of thecylinder)(circumference of the circle) or h(2πr).So, the total surface area of the cylinder is2πrh + 2πr²
• 3. You can use algebra to make thetotal surface area formulashorter:2πrh + 2πr²
• 4. Find the total surface area of the cylinder.3 cm10 cmSA=_______________SA=_______________SA=_______________
• 5. 8 cm8 cmSA=_______________SA=_______________SA=_______________
• 6. I want to wrap a gift that comes in a cylindricalcanister that has a height of 18 in and a diameterof 3 in. Will 175 in2 of gift wrap be enough tocover the gift?SA=_______________SA=_______________SA=_______________
• 7. Homework:P. 554-555 #12-15, 17, 19, 20 allShow 3 steps!1. Formula2. Substitution3. Answer w/label