Why is the least number of acute angles that a triangle can have

A triangle must have at least two (2) acute angles.

- - An acute angle is an angle less than 90°.

- - If the triangle only had one of them, then both of

the other angles would each be bigger than 90°.

- - If they were, then just those 2 alone would add up to more than 180°.

- - That can't happen, because the 3 angles in a triangle

always add up to exactly 180°.

- - So the triangle can't have only 1 acute angle.

It must have either 2 of them, or else 3 of them.