A triangle has side lengths of 7, 24, and 26. Is the triangle right, acute, or obtuse?

A) Right

B) Acute

C) Obtuse

In this case, we are given with three lengths. we can try out if the lengths follow the Pythagorean theorem. In this case, this is not a right triangle. we can use cosine law to determine angle opposite to length 26. theta is equal to 98.73 degrees. This is an obtuse angle, hence answer is C