10. i. QP = 3RS = 3c ii. I don't see a way for SP.
11. Triangle ABO is equilateral that means AB is 6a. Also 6a = 6b.
a.
i. AB = 6a or 6b ii. EF = 6a or 6b all the sides are equal.
b. BY=4a or 4b
c.triangle BXY is equialateral. EXY is on the same l;ine.