Answer:
The total length will be "10 units". A further explanation is given below.
Step-by-step explanation:
The given points are:
R(−2, 4) 
S(3, 4) 
T(3, −1)
On applying the distance formula,
⇒ 

⇒ 

⇒ 

⇒ 

⇒ 

and,
⇒ 

⇒ 

⇒ 

⇒ 

Now,
The total trail length will be:
= 

= 

= 
