la surface est de 12.566370614359m^2<svg viewBox='0 0 50 15' xmlns='http://www.w3.org/2000/svg'>
                <circle cx='5' cy='7' r='2'/> 
                </svg>la surface de ce ractangle est200m^2<svg viewBox='0 0 50 50' xmlns='http://www.w3.org/2000/svg'>
             <rect x='1' y='1' width='20' height='10' />
             </svg><svg height='70' width='300'>
            <polygon points='200,70 200,15 300,10' style='fill:black;stroke:purple;stroke-width:1' />
            </svg>