Question

Hello please help anybody ​

Answer 1

Answer:

↪ 864 units²

Step-by-step explanation:

We have the square in the base and four triangles on the lateral surface.

The formula of an area of a square:

↪ $\sf\:A_{\square}=a^2$

We have a = 16. Substitute:

↪ $\sf\:A_{\square}=16^2=256$

The formula of an area of a triangle:

↪$\sf\:A_{\triangle}=\dfrac{bh}{2}$

b - base

h - height

We have b = 16 and h = 19. Substitute:

↪ $\sf\:A_{\triangle}=\dfrac{(16)(19)}{2}=152$

The Surface Area:

↪ $\sf\:S.A.=A_{\square}+4_{\triangle}$

Substitute:

$\sf\:S.A.=256+4(152)=256+608=864 \: cm^2$