The TSA of square basd pyramid is ,
Base area+1/2 * perimeter of base *slant height.
The slant height= 4 cm.
The side of a square=6 cm.
Perimeter of square =4*6
=24 cm.
Area of base= (6)²=36 cm²
Therefore, total surface area of pyramid is determined as,
[tex]\text{TSA}=36+\frac{1}{2}\times24\times4[/tex][tex]\text{TSA}=36+48[/tex][tex]\text{TSA}=84cm^2[/tex]Thus the total surface area of pyramid is determined as, 84 sqcm.