The answer depends on what instruments you have available. If you have a protractor, draw an inward facing 60 degree angle from each end of the line segment, and extend the lines until they meet.
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No.
Yes in equilateral triangle.
Yes and it will have 3 equal sides
No but it is possible for it to be an isosceles triangle with angles of 45, 45 and 90 degrees
An equilateral triangle that has a perimeter of 57 feet has three equal sides of 19 feet.