Pyramid
Cylinder
A solid figure is a three-dimensional figure, such as a tetrahedron, cube, octahedron, dodecahedron, or icosahedron. A non-solid figure, such as a triangle, square, pentagon, etc... is a plane figure.
triangle and square
circle, square, triangle, rectangle
There are very many possible shapes: a square based pyramid a triangular prism a square anti-prism a cuboctahedron a rhombicuboctahedron and possibly more. See link for images.
A circle, square, oval, hemisphere, Equilateral triangle, Isosceles Triangle
Any two dimentional geometric figure has a measurable length. This measurement is called circumference. This is also called a plane figure. Examples of plane figures with measurable lengths are: triangle, square, circle, and rectangle.
circle triangle square rectangle
square
It is a geometric figure made from 2 or more other geometric figures, Similar to a composite number is one made of 2 or more primes. Make a "house" with a square and a triangle on top. This is a composite figure.
pyramid. Base is a square, but each of the 4 sides is a triangle.
Figure width X 1/2 length of the triangle to get Square feet.