Final answer:
The Miami Triad is a group of three fraternities founded at Miami University. The fraternities that make up the Miami Triad are Phi Delta Theta, Beta Theta Pi, and Sigma Chi.
Step-by-step explanation:
The Miami Triad is a group of three fraternities founded at Miami University in Oxford, Ohio. The fraternities that comprise the Miami Triad are Phi Delta Theta, Beta Theta Pi, and Sigma Chi. These fraternities were all founded between 1839 and 1855, and they share a close relationship and collaborate on various activities and initiatives.