text: how do you find the area of a square inside a circle?? a square is inscibed in a circle with a three inch diameter. what is the area of the square?? please thoroughly explain how you got the solution!! when the circle with a 3 inch diameter....this is mean the circle with a 1.5 radius...   try to draw a circle with the square inside  and line up the middle point of the circle with one corner of the square .  after that.... draw a vertical line from the middle point of the circle to the edge of the square....  now u can see the right tirangle in the square...  let half of the edge of square is x  when u look at vertical line u drew earlier is x too  so x^2 + x^2= 1.5         2x^2=1.5           x=(3/4)^(1/2)    and the area is 2x time 2x                =(2((3/4)^(1/2)))^2                =4(3/4)                =3 inch sq