What is perpendiciular?

How many miles is 12500 feet? What arithmetic and logical concepts do I keep using over and over? Is it possible to add two vectors of unequal magnitudes an get zero? Who invented isometric drawings? Where in the bible is death described? What is roman numeral MMMCXIX in standard form? What is 3 fifth plus 1 third? Is the magnitude of a vector quantity a dimensionless number? What is 9210 in scientific notation? What does arbitrary mean in your own words? How many thirds are in -3 23? What is the slope intercept form from y-023 (x-6)? What does mass density and volume mean? How many groups of 1000 are in 1000000? What is 20 percent off of 95.13? What is the formula for finding the area of a prism? What does the number 26 mean in the Bible? If the width of a rectangle is 70 feet and the perimeter is 322 feet what is the area? What are the two consecutive numbers whose sum is 41? What number is 1356 more than 12578?