Then at RT⊿FGE, ∠ e = 90 tan 60 = root number 3.

S=t× radical number 3×t÷2

The radical sign of = 2×t? (2≥t>0)

S= radical number 3× 2 (6 ≥ t > 2)

S= radical number 3× 2-(t-8 )× radical number 3× (t-8) ÷ 2 (8 ≥ t > 6) (what is equal to? )

B.you don't have to ask for a relationship, do you?

C. Do ⊿FGE' as shown in the figure, find the relationship between s' in the same way, and then make an equation? S = S’

Just solve it.