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| 1. |
The circumference of a 9 M high wooden cone is 44 M find the surface area of the cone |
| Answer» Let radius of the base be r m; h = 9 mCircumference of the base = 2{tex}\\pi{/tex}r = 44m{tex}\\Rightarrow 2 \\times \\frac { 22 } { 7 } \\times r = 44{/tex}r = 7 mVolume of the cone =\xa0{tex}\\frac { 1 } { 3 } \\pi r ^ { 2 } h = \\frac { 1 } { 3 } \\times \\frac { 22 } { 7 } \\times ( 7 ) ^ { 2 } \\times 9 \\mathrm { m }^3{/tex}{tex}= \\frac { 1 } { 3 } \\times 22 \\times 7 \\times 9 \\mathrm { m } ^ { 3 }{/tex}= 22\xa0{tex}\\times{/tex}\xa021 m3= 462 m3 | |