For triangles, which of the following statement(s) are true? (a) Sum of interior angles is 180°. (b) All interior angles can’t be equal. (c) Can have at the most one obtuse angle. (d) Sum of two sides may or may not be equal to the third side.
(a) and (c)
In any triangle, the sum of interior angles is always 180°, and it can have at most one obtuse angle. Thus, statements (a) and (c) are correct.