What is the ealiest known reference tp pi in history in 1352?

What is an object that is about 1 dm long? How do you convert a alphabet into binary form? How big is a room that is 275 square feet? What grade would a 14 year old be in? How do you make 3 to the 3rd power on the keyboard? How old am I if 400 reduces by 2 times my age is 244? What do the ' and signs in coordinates mean? How do you convert concentration to grams per gram? How do you express the number 0.0003 in words? How do you figure the length of an arc? What is 30 divided by 0.5 plus 10? How many pounds is 100.8 kilograms? Is 2 pints bigger than half a gallon? Why are triangles used in the design of structures such as bridges? Can you get the sale price on an item purchased at regular price? Find the cost of carpeting a room 12m long and 8m broad with a carpet 75cm broad at the rate of Rs6.50 per meter? What is the raised area or bump on the surface of a CD? How do you turn this phrase into an expression The sum of a number x and 4 all divided by 3? What is the answer to this algebra question and how do you solve it? What is the prime factorzation of 72?