Arc neutral watch

Whether you are an architect, mathematician, or engineer, you who like π should match this "radian" watch! ·radian· Radian system — 360 degree system π / 2 = 90° π = 180° 3 π / 2 = 270° 2 π = 360° r is the radius, then the circumference = 2 π r 2 π is the circular angle 360° ·ratio· The pi ratio π = 3.14159 (the circumference is about 3 times the diameter) https://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pi-unrolled-720.gif/220px-Pi-unrolled-720.gif If the diameter of a circle is 1, its circumference is π Japanese-made quartz movement Artificial leather strap 〖A little creative museum shop〗 A little creative museum shop collects a little but diverse and unique creativity from all over the world for you, and shares short stories about products with you, allowing you to view museums around the world at home, and you can quickly buy them in stores from all over the world without going abroad. Creative! Origin/manufacturing method America