html - calculate radius of a circle using javascript -

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I am trying to calculate the radius of a circle using javascript. 

  .circle {position: absolute; width: 100px; height: 100 pixels; border-radius: 70px; background: red;}
< Pre class = "snippet-code-html lang-html prettyprint-override"> section class = "circle">

The width and height of this circle is 100x100. How do I calculate my radius?


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