How do you work out the diametre of a shape?

How is the ford circle used? Are the diagonals of a square not always be perpendicular? What are the kinds of complex numbers? Which interval you must ensure that the squad is at correct interval? What are the slopes of perpendicular lines? Why do they use two arrowheads when drawing or naming a line? What was the Romans contribution to maths today? How do you get fractions into lowest terms? How many miles is 45 laps? Why is foot fetishism so stupid? How may cm equals 0.01 m? What is the rational expression of 1 divided by 3z plus 5? What figure is formed by 3 midsegments of a triangle? How many presidentents are there? What does property of zero for addition mean? What is the whole number for 4 and 3 eighths? Which leaf has one line of symmetry? How do you spell infinitely? Wright the following numbers from least to greatest 5.03 4.73 5.3 3.15 5.25? How do I write 6 plus 6 plus 6 as an equivalent expression?