Question

Quadrilateral ABCD has coordinates A (−2, 5) , B (3, 5) , C (3,−1 ) , and D (−2,−1) . What is the length of side BC ¯ ¯ ¯ ¯ ¯ ?

Answer 1

Side BC is between coordinates B(3, 5) and C(3, -1). The x-values of these coordinates are the same, so this is a vertical line segment. Its length is given by the difference of the y-coordinates: 5 -(-1) = 6.

The length of side BC is ...
  6.