Answer:

Step-by-step explanation:
we know that
The volume of a trough is equal to

where
B is the area of equilateral triangle
L is the length of a trough
step 1
Find the area of equilateral triangle B
The area of a equilateral triangle applying the law of sines is equal to

where


substitute


step 2
Find the volume of a trough

we have


substitute


Answer:
From my understanding of the question its 104.58 for the first picture (8.3x3x4.2)
Step-by-step explanation:
All you need to do is multiply the length width and height. it will give you the volume of the object. For your understanding, you can try the second one as practice for these type of problems.
You first multiply across

and

=

. Then you divide the numerator(the top) by the denominator(the bottom) which is

=

just 12