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Please help me idk this

Please help me idk this-example-1

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Answer:


\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

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