x2 + y2 = 2r2
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
Radius = 1111
7
The ' 1 ' in that equation is the radius.
Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
Radius = 1111
9
8
7
56
The ' 1 ' in that equation is the radius.
Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.
If that equals 16 then the radius is 4
x^2+y^2=36
3 (which is the sqrt of 9)
sqrt 36 ie 6