mjchey
Answered

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 Can someone plz help me

What is the surface area of the figure?     A. 408 ft2   B. 458 ft2   C. 545 ft2   D. 720 ft2

Can Someone Plz Help MeWhat Is The Surface Area Of The Figure A 408 Ft2 B 458 Ft2 C 545 Ft2 D 720 Ft2 class=

Sagot :

Scryt
There are 2 faces 7 x 5

[tex]2*(5*7)=2*35=70ft^2[/tex]

There 2 faces 5 x 5

[tex]2*(5*5)=2*25=50ft^2[/tex]

there are 3 faces 5 x 12

[tex]4*(5*12)=4*60=240ft^2[/tex]

There are 2 faces 7 x 7

[tex]2*(7*7)=2*49=98ft^2[/tex]

Now only we have to sum all of them together

[tex]98+240+50+70=458ft^2[/tex]
View image Scryt
Lilith
[tex]cuboid : \\ \\ l=12 \ ft , \ \ w = 5 \ ft , \ \ h= 7 \ ft \\ \\ A = 2wl + 2lh + 2hw \\ \\A=2\cdot 5\cdot 12 + 2\cdot 12\cdot 7 + 2\cdot 7\cdot 5 = 120+ 168 +70 = 358 \ ft^2 \\ \\ cube: \\ \\ four \ side \ walls : \\ \\ s= 5 \ ft \\ \\ 4 \cdot s^2 = 4 \cdot 5^ 2 = 4*25 = 100 \ ft^2 \\ \\ surface \ area \ of \ the \ figure : \\ \\ 358 +100 = 458 \ ft^2 \\ \\ Answer : \ B. \ 458 ft^ 22 [/tex]
View image Lilith
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