When you have a fraction on each side of the equals you can multiply the denominator of the left side times the numerator of the right. It will equal the product of the numerator on the left side times the denominator of the right.
That is called cross products.
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Because in dot product we take projection fashion and that is why we used cos and similar in cross product we used sin
cross product
The answer is cross products.
You need to know the area of that cross-section. Once you have that number, the volume of the box is the product of (cross-section area) x (height).
To find the cross product of two vectors:If a = [a1, a2, a3] and b = [b1, b2, b3], thena x b = [a2b3 - a3b2, a3b1 - a1b3, a1b2 - a2b1] or(a2b3 - a3b2)i + (a3b1 - a1b3)j + (a1b2 - a2b1)k