To solve this, we are ggoing to use the formula below:
![T.S.A=A+\text{ }(1)/(2)ps](https://img.qammunity.org/2023/formulas/mathematics/college/8it6irmapdloj80ixuvrkzqnbzy1kpzwvd.png)
where A is the area of base
P is the perimeter of base
s is the slant height
From the diagram given,
Area of the base which is the area of the square is given by
A= 5 x 5 = 25 cm²
Area of the four triangles is given by
![Area\text{ of the 4 triangles = }(1)/(2)*5*8*4](https://img.qammunity.org/2023/formulas/mathematics/college/iztsytzse6304fg2lrw3sbhz7jzktds6e6.png)
![=80cm^2](https://img.qammunity.org/2023/formulas/mathematics/college/egxgodqg4znvgx4mg0pki223s019pb65xu.png)
![T\mathrm{}S\mathrm{}A=25+80=105cm^2](https://img.qammunity.org/2023/formulas/mathematics/college/e6v58n28k16ksb0lv7mfntgcl9vyescdt3.png)