Question

What is the equation for a circle centered at the origin (0,0)?


a) r sqt = x sqt + y sqt
b) r sqt =(/x+y) sqt
c) r= /x+y
d) r=x+y

Answer 1

Answer:

${ \sf{ \sqrt{r} = \sqrt{(x {}^{2} + {y}^{2} ) } }}$

Step-by-step explanation:

General equation:

${ \bf{ {x}^{2} + {y}^{2} + 2ax + 2by + c = 0}}$

but a and b are 0:

${ \bf{ {x}^{2} + {y}^{2} = {r}^{2} }} \\ { \bf{ \sqrt{ {x}^{2} + {y}^{2} } = \sqrt{r} }}$