Trigonometry Functions

Question

Given (x, y) = (5, 10), find r.

Here are my answer options:

5 

5 

2 

5 

I don't know what goes into the square root.

Answer 1

I'm assuming it is asking for the radius from the origin to the point given, (5,10)

r = √(5²+10²) = √125 = √25•5 = 5√5