Respuesta :

calculista

Answer:

The surface area of the figure is [tex]SA=458\ ft^{2}[/tex]

Step-by-step explanation:

we know that

The surface area of the figure is equal to

[tex]SA=2B+PH[/tex]

where

B is the area of the L-shaped cross section

P is the perimeter of L-shaped cross section

H is the width of the figure

Find the area of the L-shaped cross section

[tex]B=12*7+5*5=109\ ft^{2}[/tex]

Find the perimeter P of L-shaped cross section

[tex]P=(12+7+7+5+5+12)=48\ ft[/tex]

[tex]H=5\ ft[/tex]

substitute

[tex]SA=2(109)+(48)(5)=458\ ft^{2}[/tex]

imlittlestar

Answer:

Surface area = 458 square ft

Step-by-step explanation:

From the figure attached with this answer we can see figure.

To find the surface area of the figure

Surface area is sum of area of  small rectangles

Surface area = 2(12 * 7 ) + 4(5 * 5) + 2(12 * 5) + 2(7 * 5)

= 2*84  + 4*25 + 2 *60 + 2*35

 = 168 + 100 + 120 + 70

 = 458

Therefore surface area of given figure = 458 square ft

Ver imagen imlittlestar