How the **** do i figure out the volume of a triangle

[I Like Waffle]

Obviously i fail at math but im trying to figure out the volume of this triangle-ish box im working on designing. I think im going in the wrong direction here but i need about 7 cubes net, and a box no taller than 15 inches, has to be slant face as the subs are 15.5 inches wide. Im gonna attempt to do this myself but im having trouble planning everything out before i get the materials

Heres my max specs. I could go bigger but i wanna leave a little airspace around the box too.

15.5 inches tall

18 inches deep

55 inches wide (this is pushing the limits of my trunk, i have 60 inches of width in total, at the trunk opening)

heres what i got so far

Click to read more...

 

[jdawg 5,000+ posts]

add top and bottom depth and divide by 2, thats the length of the depth

 

[budahbuddy803 10+ year member]

separate that into a triangle and a rectangle. for the triangle its (1/2)(base)(height)(length) and then for the rectangle its just (H)(W)(L)

 

[Worlddre 5,000+ posts]

Measure the depth and the 1/2 the height use that as your "D" in ( L * W * D/1728) and there is your answer

 

[Loud3 10+ year member]

If all else fails, build it, and fill it with packing materials.

Then empty the packing materials into a square or rectangular container.

Measure said packing materials.

 

[jco1385 5,000+ posts]

use geometry skills learned in 10th grade

 

[john denver 10+ year member]

im getting just under 7 like 6.8 assuming those are outer dimensions using 3/4"

 

[Buck 5,000+ posts]

You are a fucking retarded //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[Flipx99 5,000+ posts]

A triangle is two dimensional; thus no volume.

A prizm is the word you are looking for.

 

[I Like Waffle]

that will get me about 4 1/2 cubes before displacement. Im gonna have to figure out something else //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[Lakota 5,000+ posts]

Area of that triangle = (1/2)(12)(14) + (4)(14)

Multiply it by how many inches you want to extrude it and you'll get its volume in cubic inches.

Divide it by 12*12*12 to get cubic feet.

 

[funkyab 10+ year member]

there is a calculator for that specific box shape on BCAE.

 

[farmerehsan 10+ year member]

http://www.bcae1.com/spboxnew2.htm

half way down

 

[farmerehsan 10+ year member]

2.982 cubic feet?

 

[Pioneer~Saturn 5,000+ posts]

Just seperate it into two pieces...the rectangle on the right and the triangle on the left....then simply find the area of the rectangle and then just (height x width = y....then y/2 will get you the area of the triangle)...then add that to the rectangle's area and multiply it by your depth of the object for your volume //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif