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tomorrow to coming generations| IMPORTANT QUESTIONS FOR PRACTICEVery Short Answer Type Questions [1 Mark Each]If a wire is bent into the shape of square whose area is 81 cm2. When the same wirebent into a semicircular shape, then find the area of the semicircle.1.cimla of radius 5 7 cm is 27.2 cm, then find the area |
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Answer» Area Of square a^2 = 81 ====> a = 9The wire when bent in a form of Square i.e. the total perimeter of the square Therefore,Perimeter of Square = 4a = 4*9 = 36 which is total length of the wirethe wire which is bent in the form of semicircle forms circumference of semicircle therefore circumference is 22/7r+2r = 36 where 'r' is radius(22+14)*r/7 = 36 r = 7 cm Therefore area of semicircle is {(22/7)r^2}/2 = (1/2)*(22/7)*7*7 we get Area of semicircle = 77 cm^2 |
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