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Posted

I'm driving myself crazy....can't seem to wrap my head around this...trying to figure out the volume of this...trapezoid or whatever this shape is called. Hopefully someone can lend a hand!!

untitled-1.jpg

 

I need the volume to be ~ 0.75 cu. ft. but I'm limited to size of it.......... :curse:

Posted
I'm driving myself crazy....can't seem to wrap my head around this...trying to figure out the volume of this...trapezoid or whatever this shape is called. Hopefully someone can lend a hand!!

untitled-1.jpg

 

I need the volume to be ~ 0.75 cu. ft. but I'm limited to size of it.......... :curse:

Divide it into 2 parts:

The "triangle" part is

1/2LWH

in this case 1/2*7.25*18*3.5 or 228.375 cubic inches=.132 cu ft

the "box"

LWH

9*7.25*18=1174.5 cu in. =.679 cu ft.

 

So I get .811

Posted

Sorry rick i was doing it on microsoft calc and my keyboard sucks so i had a bad #

 

the third time i got it right.

 

Area of rectangle + area of triangle

 

Looks to me like yer making a subwoofer box.

Posted

right on thanks guys. ya im building a sub box. will mess around with the numbers a bit to figure out the best. i need the angle sheet to be at least 10.75" so my sub can fit while keepin that volume the same. I dunno...not even a year out of uni and cant remember any of this...top angle is 90 ya. may just save myself the hassle and have some shop build it for me...

Posted
I have to 10" JL audio subs in a box if you would like to purchase.

 

I have 2 10" ones in a box already..but wont fit in my truck..tryin to put one in...thanks though..

Posted
I am pretty sure you need to know at least one more angle or are we assuming the top angle is 90 as well? :devil:

You don't need it, but it's (inv)tan(7.25/3.5) if memory serves.

 

64.23 Degrees-this is the angle at the bottom of the triangle.

So 25.77 on the top.

 

The length of the hypotenuse is 8.01, I think.

Posted
Hey man don't knock on us...........we do it for a living.

 

Hey rick I need some wireline advice soon. Theres some beers in it for ya.

 

Anytime bruthah.

 

Haven't used trig in years. My memory is like a steel trap. Full of holes.

 

To the nerd comments, I like to consider myself more of a renaissance man. I'll go ahead and include Dave in that group. There are not many of us!

Posted
...... tan aint a number rick its when u get darker after ur exposed too sun <--poke--<

 

 

that's awsome Max.

Whoa.... LMAO thanks for pointin' that out... that somehow got lost when I usin' the Max to English translator

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