Okay, I know I must sound like a complete idiot here, but please bear with me. I've come across a scenario in which I have triangle ECF. Angle ECF = 60 degrees, Angles CEF and CFE are unknown, lengths EC and FC are unknown and equal and length EF is r√3 and not equal to lengths EC and FC I know it has to be an isosceles triangle, but because angle ECF = 60 the remaining angles must both also be equal to 60 degrees. I'm not sure if this is possible or not. Also, sorry if this is a very basic question but I have honestly never encountered this scenario before. Any help is much appreciated.