Answer with explanation:
Options are:
1. each side has a different length,
2.two sides have the same length which is less than the length of the third side,
3. the three sides have the same length,
4.the sum of the lengths of two sides is equal to the length of the third side
⇒It is given that, each three interior angle of triangle is equal to 60°.Since if in a triangle two opposite angles are equal, side opposite to them are equal.So, all the three sides of triangle are equal using this property.
Option C:→→The three sides have the same length.