∆ABC has the points A(1, 7), B(-2, 2), and C(4, 2) as its vertices.
The measure of the longest side of ∆ABC is ______ units. ∆ABC is_____ triangle.

If ∆ABD is formed with the point D(1, 2) as its third vertex, then ∆ABD is _____ triangle. The length of side AD is ______ units.

1. 
B.29^(1/2) . 
C.34^(1/2) 
D.6 
2.
A.equlaterial
B.isoclese
C.right
D.scalene
3. 
A.equilateral 
B.right isosceles 
C.right scalene 
D.non-right isosceles
E.non-right scalene

4.
A.3
B.5
C.8
D.10