An archery target was drawn using three circles with the same centre O, The radius of the three circles are 35 $$cm$$, 21 $$cm$$ and 7 $$cm$$ respectively. (Take π = $$\frac{22}{7}$$) <hr>Find the area of the unshaded part. <br> <input min="0" type="number" id ="imp6pg188q3a_1" class="lineinput" placeholder="?" /> $$cm^2$$