The total surface area of frustum cone is 1200ft2. The radius of a top cone is 3 and the bottom cone is 6 ft. What is the curved surface area of a frustum of cone?
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Solution
Total surface area =π(R+r)s+πR2+πr2 Curved surface area =π(R+r)s Therefore, 1200= Curved surface area +π(62+32) 1200= Curved surface area +3.14×(36+9) 1200−141.3= Curved surface area Curved surface area =1058.7 ft.