Math
posted by Lola .
∆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.
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