Question 872798
A circle has center (0,0) and radius 6 units
a) find the equation of the circle 

The equation of the circle is {{{highlight(x^2 + y^2 = 36)}}}

b) find the value of b if(4,b)is on the circle 
 {{{4^2 + b^2 = 36}}}
{{{ b^2 = 20}}}
Therefore b = {{{highlight(2sqrt(5))}}} or {{{highlight(-2sqrt(5))}}}