Fatima plotted one side of a heptagon on a grid. the points (-8,1) and (-8,8) are joined to form a side of the heptagon. Fatima
says this side is a vertical line segment that is 9 units long. What is Fatimas error?A:The side measures 25 units, not 9 units.B:The side measures 7 units, not 9 units.C:The side measures 16 units, not 9 units.D:The side measures 8 units, not 9 units
The general formula for the distance between two points is
Anyway, if A and B have the same x or y coordinates, this formula can be simplified. For example, in this case the two points have the same x coordinate of -8, so the following part of the formula simplifies:
So, we're left with
but the square root of a square is the absolute value of the object being squared: