No.
It would not because 8^2 + 9^2 = 10^2 is not true. (Pythagorean Theorem.)
64 + 81 = 100
With 3, 4, and 5, however, a right triangle is formed:
3^2 + 4^2 = 5^2
9 + 16 = 25
25 = 25
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it is an acute triangle.
false In order for this to be a right triangle, the sum of the squares of the two shorter sides would have to equal the square of the longest side. 102=100 242= 576 272=729 102+242= 676, which does not equal 272=729, so a triangle with these lengths is not a right triangle.
Yes.
10
10(radical "2") units, or about 14.1 units.