What are the significant digits in the number 12080

There are a few rules to significant figures. The first is that any non-zero digits count as significant figures, so 1, 2 and 8 are significant figures. Now we have 3 significant figures so far.

(significant figure = sigfig = sf)

There are a few cases in which zero can count as a significant figure. If it is between two non-zero digits, like in 405 (3 sig fig) or in 6074 ( 4 sig fig), so the zero between the 2 and the 8 counts as a significant figure, raising the total of significant figures up to four.

Another case is when a zero is added on the end of a decimal, like in the example 2 (1sf) versus 2.0 (2sf) This is essentially the same as 2, but has 0 added on the end, after the decimal. This zero counts as a significant figure. 12080 has no decimal point, so this does not matter in this example.

The total number of significant figures is 4.

so the perpendicular line goes through the given pointyou would get a perpendicular line at some random location

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.