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| 1. |
Find the area of a circle whose circumference is 22 cm. |
| Answer» Let r be the radius of the circle. It is given that the circumference of the circle is 22 cm.Now, Circumference = 22 cm{tex}\\Rightarrow2 \\pi r = 22{/tex}{tex}\\Rightarrow 2 \\times \\frac { 22 } { 7 } \\times r = 22{/tex}{tex}\\Rightarrow r = \\frac { 7 } { 2 } \\mathrm { cm }{/tex}Area of the circle =\xa0{tex}\\pi r ^ { 2 } = \\frac { 22 } { 7 } \\times \\frac { 7 } { 2 } \\times \\frac { 7 } { 2 }{/tex}cm2\xa0= 38.5 cm2 | |