Dreaming that you are in a triangle shows that you are dissatisfied with your family or friends now. But you don't show a sense of resistance. On the contrary, you want to deal with it cleverly.
In this case, you should take the initiative to confide in your family and friends and clearly express your dissatisfaction to reach a consensus and resolve your differences.
A triangle means fixed, reliable, and firm, which means that you are in trouble and want help.