Question

Given that (x, y) = (5, 10), find r.

a.2√5

b.5√2

c.5√5

d.5√10

Answer 1

I am considering the point you have given is point on a circumference of a circle and center of circle is (0,0) and we have to calculate radius

so radius = root((x-h)^2 + (y-k)^2)

where (h,k) is center of circle

so r = root((5-0)^2+(10-0)^2)

= √(100+25) = √125 = 5√5

so answer is option c