Step 1: Uselewis structure guidelines to draw the lewis structure of NO2.
Step2: Apply VSEPR notation, A X E
A=Number of central atoms
X=Number of surrounding atoms
E= Number of lone pairs on central atom
For the above molecule VSEPR notation will be AX2E1
Step 3: Use VSEPR table to find the shape.
AX2E has angular/bent shape. So the shape of NO2 molecule is angular/bentl.
Download a copy of VSEPR shapes table here