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

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

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) } = √(r) }}`