Where is the polygonal tools in window?

Just use the ordinary Lasso tool together with the Alt key.  You can hold down the Alt key before you first click of the mouse, and keep it held down. When done, let go of the Alt key, the selection will close.  To add to that selection with the Lasso tool, first hold down the Shift key, then hold down the Alt key, and continue clicking with the mouse.

Removing from a selection using the Lasso tool is a little bit more tricky.  First hold down the Alt key. Then click and hold down the mouse button. Then release the Alt key and then hold it down again. You can then continue to click with the mouse while holding down the Alt key, and remove selected pixels.

Hi @sunder_2079 
In addition to @Sameer K's comment:
The polygon lasso is not available in all workspaces by default.

Switching to the Essentials (default) workspace often helps to quickly “restore” the commonly used tools (see screenshot 2).