Area of Cross-Section

Algebra

Area of Cross-Section

Postby Guest » Sun May 14, 2017 11:26 pm

A cross-shaped piece of metal has two opposite arms 4 1/2" in length, and the other two 4" in length. The arms are 1/2" in thickness. Determine area of cross-section.

Unsure how to proceed.





Guest
 

Re: Area of Cross-Section

Postby Guest » Wed May 17, 2017 8:47 am

Could you upload an image and write your suggestions, please.

Guest
 

Re: Area of Cross-Section

Postby Guest » Wed May 17, 2017 1:50 pm

Image attached.

A is the 4 /12".

B and C are the 4".

T is thickness.

Attachments
CROSS.jpg
CROSS.jpg (38.82 KiB) Viewed 310 times
Guest
 

Re: Area of Cross-Section

Postby Guest » Thu May 18, 2017 10:57 am

You have to sum the area of 2 pair of rectangles and the square in the middle.

The first pair of rectangles area is [tex]2 \cdot 4\frac{1}{2} \cdot \frac12 = 4\frac{1}{2}[/tex]
The second pair of rectangles area is [tex]2 \cdot 4 \cdot \frac12 = 4[/tex]

The area of the square in the middle is [tex]\frac12 \cdot \frac12 = \frac14[/tex]

The sum of these 3 numbers is [tex]8 \frac12 + \frac14 = 8\frac24+\frac14 = 8\frac34[/tex]

Guest
 

Re: Area of Cross-Section

Postby Guest » Thu May 18, 2017 10:57 am

Is it clear?

Guest
 

Re: Area of Cross-Section

Postby Guest » Thu May 18, 2017 2:41 pm

Yes, it is clear. Thanks.

One question:

If I wanted to determine the weight, do I need do add another thickness or use the present dimensions?

Guest
 

Re: Area of Cross-Section

Postby Guest » Sat May 20, 2017 5:26 am

You need thickness because in order to calculate weight you have to know the volume of the figure not its area.

Guest
 

Re: Area of Cross-Section

Postby Guest » Sun May 21, 2017 12:08 pm

Thanks again.

Guest
 


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