Determine whether the three points are the vertices of a right triangle. See Example 3.

$(-2,-8),(0,-4),(-4,-7)$

Determine whether the three points are the vertices of a right triangle. (-4,1),(1,4),(-6,-1)

Determine whether the three points are the vertices of a right triangle. See Example 3.

$(-2,-5),(1,7),(3,15)$

Determine whether the three points are collinear. (0,-7),(-3,5),(2,-15)

Determine whether the three points are collinear. (-7,4),(6,-2),(-1,1)

Find the coordinates of the other endpoint of each line segment, given its midpoint and one endpoint. See Example 5(b).

midpoint $(5,8)$, endpoint $(13,10)$

Find the coordinates of the other endpoint of each line segment, given its midpoint and one endpoint. See Example 5(b).

midpoint $(12,6)$, endpoint $(19,16)$

Find the coordinates of the other endpoint of each line segment, given its midpoint and one endpoint. See Example 5(b).

midpoint $(6a,6b)$, endpoint $(3a,5b)$