Question

triangle ABC and triangle DEF are equilateral triangles,area of trianglr abc : area of triangle DEF = 1 : 2 . If ab = 4 What is the length of DE?
A) 2√2
B) 4
C) 8
D)4√2



(plz its urgent))

Answer 1

i hope you understand my solution

Answer 2

both are equilateral triangle so angle between them is 60°.
It's sufficient to make 2 tariangles similar.
For similar Triangle,
Area of ABC/Area of DEF=(AB)^2/(DE)^2=(BC)^2/(EF)^2=(AC)^2/(DF)^2