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? ..
x2 + y2 = 81
x2 + y2 = 81
3 (which is the sqrt of 9)
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? ..
9
x2 + y2 = 81
x2 + y2 = 81
3 (which is the sqrt of 9)
Since the circle is centered at the origin, the equation of the circle is x2 + y2 = r2. So we have: x2 + y2 = (3/2)2 x2 + y2 = 9/4
9 (APEX)
x2 + y2 = 81
Standard equation for a circle centred at the origin is x2 + y2 = r2 where r is the radius of the circle. If you increase the size of the circle then the radius must increase, so r2 will be larger. eg a circle of radius 2 has the equation x2 + y2 = 4, if the radius increases to 3 then the equation becomes x2 + y2 = 9
x2 + y2 = 9
Draw a circle with its center at the origin and a radius of 3.