# Math Pi Lapel Pins

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Pi is the ratio of the circumference of the circle to the diameter, usually expressed in the Greek letter π, and is a mathematical constant that is prevalent in mathematics and physics. π is also equal to the ratio of the area of the circle to the square of the radius. Is the key to accurately calculate the circumference of the circle, the area of the circle, the volume of the ball and other geometric shapes. In the analysis, π can be strictly defined as the smallest positive real x that satisfies sin x = 0.

Ancient Greece as the ancient geometric kingdom of the contribution rate is particularly prominent. The ancient Greek mathematician Archimedes (287-212 BC) pioneered the history of human history through the calculation of the circumference of the approximation of the precedent. In 2011, the International Mathematical Society officially announced that the annual March 14 will be the International Mathematics Festival, the source is the ancient Chinese mathematician Zu Chongzhi of the pi.

Here is the math π lapel pin: big logo π center and many start around, four big star and 12 small star. Back ground is black, all raised metal are gold, also back is gold too. Gold pins also like guitar pins and lion lapel pins.

Below is the details:

1) Math π lapel pins

2) Material: Iron/Bronze

3) Size: 1" or custom size

4) Attachment: Butterfly clutch or rubbers

5) Production process: Die stamping-gold plating-soft enamel

6) Minimum order: No MOQ

7) Sampling time: 7 days

8) Delivery time: 10-15 days for 100-5000pcs

9) Packaging: Each into a free poly bag

10)Payment Terms: T/T, Western Union, Paypal