Any shape you like. A stone that is thrown is a projectile. A cannonball, arrow, spear, bullet are all projectiles. A projectile s an object all of whose momentum comes at the moment of launch; once it is launched, it travels under that initial momentum and external forces such as gravity and air resistance. There is no "on board" rocket or other means of propulsion.
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three dimention
The optimal angle to fire a projectile if the objective is distance is 45 degrees. It follows that the distance traveled decreases whether the angle is increased or decreased from 45.
The noun forms are: projectile, and the plural projectiles.The verb forms are: project, projects, projecting, projected.The adjective forms are: the present participle projecting (a projecting nail), and the past participle projected (a projected offer).The present participle of the verb is also a gerund, a verbal noun: projecting.
the shape of an acute is V shape.
It has a definite shape