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Answer:
Step-by-step explanation:
Pythagorean theorem: a²+b²=c²
a (the shortest side) = 8ft
b (the 'height') = 15ft
c (the longest/ diagonal side) = 17ft
if a²+b²=c² then it is a right angle triangle
8² + 15² = c²
c² = 289
c = √289
c = 17
hence, proven
hope this helps