Question

Find the surface area of the figure to the nearest whole number.

Answer 1

A. 310 ft2

B. 158 ft2

C. 135 ft2

D. 74 ft2

Answer 2

I think it is 74 ft2 ????

Answer 3

how did you get 74?

Answer 4

Don't forget to subtract interior faces.

Answer 5

I'm so confused

Answer 6

There are so many formulas

Answer 7

you will use 2 formulas

area of a rectangle: A = L*W

area of a triangle: A = (b*h)/2

Answer 8

I'd take it as viewing each face separately.
You have the bottom face which is 4.5 by 4.5, which equals 20.25ft^2.
Next, there are four rectangular faces each with 4.5 by 6ft dimensions, which comes out to four sets of 26, which equals 104ft^2.
Now the last set is the top four pyramidal faces which the way to find the area of a triangle is bh/2. Now the h is 3.3 which is given, and by moving up the 4.5 from the bottom edge to the pyramidal edge, you have the base and height you need. (4.5)(3.3)/2 is equal to one triangle, but there are four, so you can multiply this by 4 right now to receive this:
(4.5)(3.3)(2)
Now multiplied out, you get 29.7ft^2.
Now add up 20.25, 104, and 29.7 to get 153.95
I'm not positive why I came out with an answer which is incorrect but this is the way I solve surface area. Sorry.

Answer 9

A=4.5*6
A=27

Answer 10

flixoe,

4.5*6 = 27, so multiply that by 4 to get 108

Answer 11

A of triangle= 4.5*2.5/2
A=5.63

Answer 12

I dont get it

Answer 13

the only thing you need to fix in flixoe's work is that 4*4.5*6 should be 108 and not 104

so the answer is really 20.25+108+29.7 = 157.95 which rounds to 158 sq ft

Answer 14

Thank you!

Answer 15

yw

Answer 16

I'm gonna fail this course =(

Answer 17

don't say that, just keep practicing and you'll get better