Answer:
5. Statement: 
Step-by-step explanation:
Given, triangle STU is an equilateral triangle. 

To prove that 
Proof: 
1. Statement: 
Reason: Given in question .
2. Statement: 
Reason: By using reflection proeperty of rotation.
3. Statement:  is an equilateral triangle.
 is an equilateral triangle. 
Reason:  given.
 given.
4. Statement: 
Reason: Sides of equilateral triangle STU.
5. 
Reason: AAS congruence property of triangle.
6. Statement: 
Reason: CPCT ( corresponding parts of congruence triangles).