URL:https://cdn0.vox-cdn.com/thumbor/UA_DUQqd4jjlkkz61d4YvaxwLvE=/79x0:943x576/1200x800/filters:focal(79x0:943x576)/cdn0.vox-cdn.com/uploads/chorus_image/image/49070027/8476624791_ac7a5a8357_b.0.0.jpg
掲載元:http://www.theverge.com/2016/3/14/11218914/pi-facts-pi-day-i-did-it-pi-way