Need help with a math question

Answer:
[tex]d =\sqrt{(b-0)^2 +(c-a)^2}[/tex]
Step-by-step explanation:
We know that the distance between two points is calculated using the following formula
[tex]d =\sqrt{(x_2-x_1)^2 +(y_2-y_1)^2}[/tex]
In this case we look for the RS distance
Then
The starting point is: (0, a)
The final point is (b, c)
So
[tex]x_2 = b\\x_1 = 0\\y_2 = c\\y_1=a[/tex]
The distance is:
[tex]d =\sqrt{(b-0)^2 +(c-a)^2}[/tex]