2 root 5 is the simplified version
Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The length of the treads is 
The length of the risers is 
Generally the slope of the staircase is

=> 
=> 
-1 3/10 is the correct answer
Answer:
2. 20/30
Step-by-step explanation:
15/18 /3 =5/6
30/36 /6 =5/6
10/12 /2 =5/6