Question

Please help me idk this

Answer 1

`\large\boxed{Surface\ Area=63\ cm^2}`

Explanation:

We have

square with sides s = 3cm

four triangles with base b = 3cm and height h = 9cm.

The formula of an area of a square:

`A_\square=s^2`

The formula of an area of a triangle:

`A_\triangle=(bh)/(2)`

Substitute:

`A_\square=3^2=9\ cm^2\\\\A_\triangle=((3)(9))/(2)=(27)/(2)=13.5\ cm^2`

The Surface Area:

`S.A.=A_\square+4A_\triangle\\\\S.A.=9+4(13.5)=9+54=63\ cm^2`