Question

Is used to create a perfect square or rectangular shapes by changing the line thickness in the line tool

Answer 1

Hey mate here is your answer :

The Rectangle tool creates rectangles with square or rounded sides. The Oval tool creates circular shapes such as ovals and circles. These shapes can be comprised of Strokes, which are lines that surround and define the shape, Fills, which are a color or texture inside the shape, or both.

Hope it helps.