Question

Which equation represents the rectangular form of r= 8?

Answer 1

`\underline{r^2=x^2+y^2} \\\\\\ x^2+y^2=64\implies r^2=64\implies r=√(64)\implies r=8`

Answer 2

B

Explanation:

put both sides under square root.

x^2 + y^2 = 64

sqrt ( x^2 + y^2 ) = sqrt(64)

x + y = 8

r = 8.