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c^2 < a^2 + b^2 = acute
c^2 > a^2 + b^2 = obtuse
c^2 = a^2 + b^2 = right
so
9^2 = 81
6^2 + 8^2 = 36 + 64 = 100
81<100
So the triangle is an acute triangle
Hope it helps
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