Why can’t the triangle formed be equilateral?
If you look at it carefully , you can see A kite structure formed meaning both sides have equal lengths which is 8и
RT is a chord and it wont form an equalitateral triangle with RS i dont think. cos basically if u draw a horizontal line from Q to PR and label that point like O or smth and PR-2= PO so then you'll see the right angle triangle formed and then just pythagoras n youll find RS. it doesnt form an equilateral triangle because PR and PT could really far apart, PR and PT could be perpendicular to each other and there could still be a line PT formed