A fretsaw, a jig saw, a sabre saw, a reciprocating saw or even a drill bit in a drill-press.
The Marquee tool is just a way of creating a selection in a certain shape. The rectangular marquee tool creates a selection in the shape of a rectangle (as you might imagine), whereas the elliptical marquee tool creates a selection in the shape of an ellipsis (oval) or circle.
In photoshop the oval tool is called the ellipse tool. The keyboard shortcut for all the shape tools is U (press the U key). It will highlight the currently selected shape tool in the tool bar on the left of the photoshop window. If the ellipse tool is not allready showing just click the little triangle in the lower right of the shape tool to bring up all the shape tool options, find the ellipse tool and click it. There is also an ellipse (oval) selection tool called the elliptical marquee tool. The keybaord shortcut is M for the marquee tools. To find it use the same method as above.
A Protractor is a tool used to make circles.
Oval
they used sharp rocks the shape the tool or weapon
reamer
get a bangle and bend it so it makes an oblong shape then use it like you would
select the Oval tool fromthe drawing toolbar.
A pallot
the wheelwright 's tool can used to shape the wood. So they can make a perfect size of wheel.
To make you semi-circle in Adobe Illustrator, you need to use the scissors tool to cut a circle shape perfectly in half.
First draw a 2D shape. The put on the Drawing Toolbar and on it there is a 3D tool. If you have a 2D shape selected, then clicking on that tool will change it into a 3D shape.