How do you work out the diametre of a shape?

How many 450mm x 450mm paving slabs would you need to cover 8ft x 6ft? What is 1 and one half hours before 1045? 6.5 kg equals how many mg? How much is 170000000? Are you a log? What are the function of cheliped? How do you 0.92755 in words? Is agri a suffex or root? What is 234 dived by 4? What does N 1810 on the base of a jug mean? Where is the place value of the tenths in the number 147.32? Line segment c d? What is 11 plus 13 plus 17 plus 19 plus 23 equals? Is the sides of the square pool is unknown.How will you represent its area? Code that contains both letters and digits? How many rational numbers are there between 0.2and0.3? Weight of earth in scientific notation? What do you call a pattern of intersecting lines? What is 0.04 in percent form? Is -91 or 92 greater?