Answer:
If PQ=RS then PQ and RS have the same length. Hence option D is correct
Solution:
Given that, pq = rs 
And, we have to find which of the given options are true. 
a) pq and rs form a straight angle 
We can’t decide the angle in between pq and rs just by the statement pq = rs. 
So this statement is false. 
b) pq and rs form a zero angle. 
We can’t decide the angle in between pq and rs just by the statement pq = rs. 
So this statement is false. 
c) pq and rs are same segment. 
If two things equal then there is no condition that both represents a single item. 
So this statement is false. 
d) pq and rs have the same length 
As given that pq = rs, we can say that they will have the same length 
Hence, option d is true.