What 3 concepts are covered in the Map Scale Calculator?

cross multiply

to clear an equation of fractions when each side consists of a fraction with a single denominator by multiplying the numerator of each side by the denominator of the other side and equating the two products obtained. a/b = c/d → ad = bc

map scale

the relationship between a distance on a map and the corresponding distance on the earth

measure

estimate or assess the extent, quality, value, or effect of (something).