Which classification best represents a triangle with side lengths 10 in., 12 in., and 15 in.?

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Which classification best represents a triangle with side lengths 10 in., 12 in., and 15 in.?

A) acute, because 102+122>152
B) acute, because 122+152>102
C) obtuse, because 102+122>152
D) obtuse, because 122+152>102