∆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 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. equlaterialb. isoclesec. rightd. scalene 3.  a. equilateral  b. right isosceles  c. right scalene  d. non-right isosceles e. non-right scalene4.a.3b.5c.8d.10