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thank-you very much.

I got 131.2

thats what i did wrong. i put the radii , not the diameter.

ah, yup, well as long as you understand the problem, little fixes like that can be checked and fixed

so how does the equation go??

2radii + 1/2pie +2length

yea

drum roll please........... I got belt length of 113.5in.

pellet it's not the same, what did I do wrong?

Oh ok your equation should be like (2radii+2radii)*1/2pi+2length

Would'nt you call that the circumference

yup, you are using half the circumference and then adding the length between the two pullys

half the circumference of each pully, so it be 32radii?

yea then times 1/2pi and add 80 gives you 131.2

thank-you so much.but I'm getting 130.27

I just recalculated and came up wth 131.2