???? yu tri tu sae yu hav a big hollo ring, big nuf yu kan walk inside????
& wen yu walk, the ring tern & muev along the ground???
& yu wanna muev it 25 meters
outside radius=5 meters, so need angel that add up tu 25 meters
rim leng=pi*diameter=10*3.14159=31.4159 meters
yu tern the ring angel=25/31.4159 av 1 tern=0.795775 av 1 tern
yu walk on sumthun with radius=2 meters, so yer distans=2/5 av the outside
=10 meters