Question

how to solve this type of question

quadrilateral chapter

Answer 1

It's very simple
Use mid-term theorem

Answer 2

Here is your solution

Given:-

Triangle ABC is an equilateral triangle.

Now

=> AB = BC = AC

=> DE = 1/2 AB

=> EF = 1/2 BC

 => EF = 1/2 AB

[Since AB = BC = AC] 

=>DF = 1/2 AC 

=>DF = 1/2 AB

[Since AB = BC = AC] 

DE = EF = DF

∴ ΔDEF is an equilateral triangle.

hope it helps you