Different ways can be done in Adobe Illustrator to curve a side of a shape. There are simple and short ways to do this. We will go through these methods.
Two ways to curve one side of a shape
You can take different shapes and draw them and curve one side of it. Here we use the shape of the triangle. Follow the steps below to curve one side of a shape:
Step1: Draw a triangle in Adobe Illustrator. You can draw it with pen tool.
Step2: You have to add a vertex in the side which you want it to curve. So, press (+) to add it. You can add it everywhere you want along the side.
Step3: You have to change selection to direct one. You can do it by pressing (A).
Step4: You have to bend one side in this step. To do this, you need to drag the new point to the opposite corner. This will bend the sides of the triangle to the inside of it.
Step5: Press (Shift+C) then select ‘Convert Anchor’. Drag new point to everywhere you need. You could curve one side of a shape.
Another simple and brief way: you can curve one side of a shape in Adobe Illustrator by pressing (P) and hold (AltCr) Simultaneously. Now, drag the line you want it curve to everywhere you need.