haskell - No instance for (Floating Int) arising from a use of `sqrt` -

i'm doing basic work in haskell , don't understand why isn't compiling. here's error:

shapes.hs:35:11:     no instance (floating int) arising use of `sqrt'     in expression: sqrt (hd * hd + vd * vd)     in equation `d': d = sqrt (hd * hd + vd * vd)     in expression:       let         hd = xc - x         vd = yc - y         d = sqrt (hd * hd + vd * vd)       in if d <= r true else false 

related code:

type point = (int,int) data figure = rect point point | circ point int inside :: point -> figure -> bool inside (x,y) (rect (left,bot) (right,top)) =   if x <= left && x >= right &&      y <= bot && y >= top   true   else false inside (x,y) (circ (xc,yc) r) =   let hd = xc - x       vd = yc - y       d = sqrt (hd*hd + vd*vd) in -- line 35 here   if d <= r true else false 

the sqrt function's type floating => -> -> a->. doesn't num auto convert floating, or not problem?

change circ handling code , typecheck:

inside (x,y) (circ (xc,yc) r) =   let hd = fromintegral $ xc - x       vd = fromintegral $ yc - y       d = sqrt (hd*hd + vd*vd) in    if d <= (fromintegral r) true else false 

the type of sqrt sqrt :: floating => -> a , have proper type conversion using fromintegral make typecheck.