Q3) Write a procedure, isTriangle, to determine if any three given

 numbers represent the lengths of the sides of a triangle.
       The procedure should be able to deal with any input.

I have done the following and get an error

isTriangle:=proc(a,b,c::nonnegative and numeric)
if (a^2+b^2)=c^2 then print (a,b,c "represent the sides of a triangle")
end if;
end proc;
Error, unexpected string

Thanks very much for your help!

So I've done this so far:

Marks:=proc(m::nonnegative, numeric)
if m < 40 then print (m, Fail)
elif m < 50 then print (m, `Third Class`)
elif m < 60 then print (m, `Lower Second Class`)
elif m < 70 then print (m, `Upper Second Class`)
elif m < 100 then print (m, `First Class`)
elif m > 100 then print (`error`)
end if;
end proc;
proc(m::nonnegative, numeric)  ...  end;

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