here is the question: Write a function showAreaOfCircle which, given the radius of a circle, calculates the area of the circle, <code>showAreaOfCircle 12.3</code> ⇒ <code>"The area of a circle with radius 12.3cm is about 475.2915525615999 cm^2"</code> my solution is: showAreaOfCircle :: Show a => a -> String showAreaOfCircle x = "The area of a circle with radius" ++ show x ++ "is about" ++ " " + show(pi * x * x) ++ "cm^2" but there is an error • Could not deduce (Num a) arising from a use of ‘*’ from the context: Show a bound by the type signature for: showAreaOfCircle :: forall a. Show a => a -> String at FirstStep.hs:20:1-41 Possible fix: add (Num a) to the context of the type signature for: showAreaOfCircle :: forall a. Show a => a -> String • In the first argument of ‘show’, namely ‘(pi * x * x)’ In the second argument of ‘(+)’, namely ‘show (pi * x * x)’ In the second argument of ‘(++)’, namely ‘" " + show (pi * x * x)’ I had tried to change the type declaration to Show a => Num a => a -> String i guess there must be a problem with pi. Can someone help me with the error message? Great thanks