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The area of a circular pond is 21.5 m².
Work out the diameter of the circle.
Give your answer correct to the nearest centimetre.

Respuesta :

you know the are of a circle is a=πr^2 so you substitute the a because it’s given and you get 21.5= πr^2 you divide by π getting 6.84=r^2 so you square root and you get 2.62. 2.62 is the radius so you multiply by 2 to get the diameter. The diameter of the circle is 5.24

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