How do i find the volume in a three dimensional shape?

If it is a box, multiply length by width by height.

If it is curved, you need calculus. Do triple integration.

the volume between two parallel planes

At ... the top area

Ab ...the bottom area

h ,,,,height

v = (1/3) ( At + Ab + √At * Ab)*h

it is clear for cones or pyramids,At = 0

multiply the length , width & height together.

e.g.

house brick of 10 cm x 15cm x 25 cm = 150 cm^2 x 25 cm = 3750 cm^3

depends on the shape and what you are able to do to work it out. Regular shapes, or combinations of regular shapes that can be split into small bits are fairly easy to work out (divide into small shapes that you can figure out the volume of, and add those volumes together). If the shape has an equation that defines it, then you can integrate. If the shape is very irregular, you can try volume displacement.

Simple shapes, like spheres, rectangular prisms, triangular pyramids, cones, and so on, have formulas that you can use. It can get complicated when an object is made of many smaller such basic shapes.

Can you come up with an equation to represent it? Maybe use calculus when that eq. is revolved around an axis.

That depends on its shape but normally it is: cross section area times height or length

It depends upon the shape.

Cuboid

V = L B H

Cube

V = L³

Sphere

V = (4/3) π r³

Cone

V = (1/3) π r² h

It's usually at or near the power button.

Keep trying