A wheel with 64 spokes will have 64 spaces between the spokes.
A wheel with 10 spokes will have 10 spaces between the spokes.
sprag
A wheel with 12 spaces will have 12 spokes.
18.4 inches
There would be 20 spokes with 20 spaces. Picture each space as if it was a flag and each spoke as a flagpole.
360 / 30 = 12 , so 12 spokes in that wheel.
The angle is pi/4 radian. If you are at an early stage in studying mathematics, that is 45 degrees.
There are 360 degrees in a circle, so all you have to do is divide 360 by 15 and you get 24 degrees between each spoke.
18. Picture it this way. If a wagon wheel had 2 spaces, it is easy to see that it would have two spokes, say, top and bottom. Adding another spoke would block off another space. From this idea, you can see that the number of spaces must equal the number of spokes.
"Spokes" are the things that branch out from the centre of wheels to the outside edge of the wheel, to stabilise them. So wagon spokes are the things that branch out of wagon wheel centres (usually wooden, in this case). Bicycle wheels also have spokes.
A wheel