"A Map Is Drawn To A Scale" means that all distances and measures on the map are the same as in real life but scaled down, ratio and proportions as conserved. with the map you'll find the scale ratio used, like "100 miles = 1 inch" ...

it means that all distance and measures on the map are the same as in real life

It means that the scale (such as 1:100) ,eans than 1 Inch or cm on the map is equivilant to 100 in real life

a map drawn to scale is a map that is accurate with respect to relative distances. so for example, let's say North St. is 10 miles long and South Street is 6 miles long. further, let's say the map key indicates that one inch = 10 miles. if the map is drawn to scale, south street would be .6 inches and north street would be 1 mile. so, by looking at the map with a compass, you will be able to determine the distance between any two points by multiply the distance on the map by 10.