Prove:
△ABC
has at least one angle with measure
60°
or less
since the three angles sum to 180, they cannot all be over 60.
To prove that a triangle △ABC has at least one angle with a measure of 60° or less, we can use the fact that the sum of the angles in a triangle is always 180°.
Let's assume that all angles in △ABC are greater than 60°. If all three angles are greater than 60°, their sum would be greater than 180°, which contradicts the fact that the sum of the angles in a triangle is always 180°.
Therefore, we can conclude that there must be at least one angle in △ABC with a measure of 60° or less.