@hirnyk Thanks for ur help, all i needed to do was type in Pi with a capital P which i now realise. Thanks

@hirnyk Thanks for ur help, all i needed to do was type in Pi with a capital P which i now realise. Thanks

@hirnyk 

yes, but the fraction is called the letter d for distance, and if you do evalf(d) it does nothing.

@hirnyk 

yes, but the fraction is called the letter d for distance, and if you do evalf(d) it does nothing.

@hirnyk 

well the answer I get is something like 63000.25/pi

@hirnyk 

well the answer I get is something like 63000.25/pi

this would work, but i've made a model and the number i enter at the start will change when i need them changing. The value with pi in it I have called d, but when I do evalf(d); it doesn't do anything. It just outputs the same thing.

this would work, but i've made a model and the number i enter at the start will change when i need them changing. The value with pi in it I have called d, but when I do evalf(d); it doesn't do anything. It just outputs the same thing.