Courtesy of USA BMX - leftover biker vector artwork, great for flyers, logos, posters, promo material for BMX races and event clothing. Dig it 那些 t shirt 美國 USA BMX Vector Chandler-D Whip
This shows how the angles in the 30,60,90 triangle can form part of a square, hexagon, or dodecagon 令人驚歎 錢德勒 正 驚人的 30,60,90 三角