I really don't understand what you're asking about. The overwhelming majority of spokes are round, with a select few being flattened, AKA "bladed" or aero.
If you're asking why they form a triangular pattern, well that's geometry for you. A triangle is a very natural shape to end up with when you start connecting things with straight lines.
A wheel with 10 spokes will have 10 spaces between the spokes.
hold tire in place
That would differ from one bike to another. A really small bike with maybe 12" wheels will have fewer spokes than a bike with 20" wheels. Say between 24 and 36.
adjust the bike and us tools to structure it
Yes there are they are of a stronger metal than a push bike.
Well, water colors, no; any can of paint, sure. Clean and scuff spokes for max adherence.
Folks On Spokes. It's a bike trail.
the bike wheel has three spokes and the idea came from air foils on a space shuttle
There are a number of ways in which you could make your bike click. You could add a card to the spokes for example.
you cant tighten spokes on an ATV, they have solid aluminum or steel rims. but you can tighten spokes on a dirt bike by getting a spoke wrench and tightening the nipple at the end of the spoke closest to the rim.
The tire is only the rubbery part on the outside, and it hasn't got any spokes. The wheel (which also includes hub and rim) has spokes, usually 36 of them but other numbers are possible.
It depends if you have a 3 piece crank, spokes, brakes.