Imagine a rectangle and like unfold it or make a net,that's how you call a solid shape unfolded an it is a 2-d shape but when you fold it it is a 3-d shape that's kind of an activity to do it is really fun.
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yes, all shapes have one net,
The next of an octahedron looks like a series of 8 triangles.
It looks like this.........._...._|_|_...|_|_|_|......|_|......|_|Sorry it is not the best image in the world, but it is the best I could do. Just ignore the dots, they are not included in the drawing
The net for one looks like this: http://educ.queensu.ca/~fmc/july2005/images/pyramid5.gif This is an image of one: http://homepage.eircom.net/~kevinsf/pix2/pyramidtri.gif The net for one looks like this: http://educ.queensu.ca/~fmc/july2005/images/pyramid5.gif This is an image of one: http://homepage.eircom.net/~kevinsf/pix2/pyramidtri.gif
A cross-section refers to the end of a prism, cones are not prisms. A shape like a cylinder is a prism. Hexagonal prisms have hexagonal cross-sections, and pentagonal prisms have pentagonal cross-sections. It's that simple.But for the sake of what the question COULD mean, I'll try and help.The easiest way to find the shape of a part of a three-dimensional object is to tear it apart (literally) and look at its net. The curved surface area of the cone looks like a rectangle when the cone is split open.Here are some formulas for the fun of things:Volume of cone = 1/3πr2hSurface area of cone =πrs +πr2π = Circumference (Perimeter of the circle) / Diameter (Length from one end of the circumference to the other end passing through the centre)r = Radius (Half the diameter)s = Side length (Up the side of the cone to the top)