Answer:
Δ ABC is a right triangle
Explanation:
using the converse of Pythagoras' identity
given 3 sides of a triangle a, b, c with c being the longest then if
a² + b² = c² , the triangle is right
here a = 80 , b = 150 and c = 170
a² + b² = 80² + 150² = 6400 + 22500 = 28900
c² = 170² = 28900
Since a² + b² = c² then Δ ABC is a right triangle.