Distance between two points (x1, y1), (x2,y2) is given by the formula
sqrt( (x1-x2)^2 + (y1-y2)^2). In our case this becomes
sqrt( (0-0)^2 + (12 -3)^2 ) =
sqrt( 9^2) =
9.
Solution 2:
Note points D and E both have x = 0 so segment DE is a vertical segment. The length is simply the difference of the y coordinates: 12- 3 = 9 as before.
Fabric needs to make a dress = 3 1/4 fabric needs to make jacket= 3 1/4 - 5/6 = 29/12 or 2 5/12 Hence total fabric needed for both pieces is = 3 1/4 + 2 5/12 = 68/12 or 5 8/12 or 5 2/3 yards
