Question

Read the following statement.

At least one angle is acute.

What is the first step of indirectly proving this statement?

A. Assume at least one angle is obtuse.

B. Assume none of the angles are acute.

C. Assume none of the angles are obtuse.

D. Assume at least one angle is not acute.

Answer 1

@Vocaloid C?

Answer 2

almost

the opposite of "At least one angle is acute." is "none of the angles are acute", not "none of the angles are obtuse"