You can make a tube (or pipe) by using a rectangle and bending it around on itself. With two circles, you can close of each end of the tube to make a cylinder.
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2D is a shape or an object that is flat and u can not pick it up, and it has 2 faces. 3D is a shape or an object that is a shape and you cant pick it up and hold it, and it can have as many faces.
a circle
A rain gauge is typically made up of a collecting container to capture rainwater, a measuring stick or ruler to measure the water level, and calibration markings to gauge the amount of rain that has fallen. Some rain gauges also include a funnel to direct rainwater into the collecting container more efficiently.
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An 8 sided octagon has 8 interior angles that add up to 1080 degrees
calculate the length of each side then add them all up same with any 2d shape
A liquid takes up the shape of a container without its volume changing.
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By its very nature of being a triangle, and a 2D shape, a triangle cannot have four plane faces. However, a tetrahedron is a polyhedron made up of four triangular faces.
To find the the area of a shape is to find the space that is enclosed within a 2D object. Do not mix it up with volume, which is the space enclosed within a 3D object.