40
20.
what is the volume of a square pyramid with base edges of 20 feet and a height of 10 feet
There are actually more than a pyramid that have that number of edges. Pentagonal star pyramid has 20 edges. Decagonal pyramid is another one.
A pyramid has one more corner and faces than the number of sides in its base; thus a decagonal pyramid has 10 + 1 = 11 faces and corners. A pyramid has twice as many edges as sides in its base; thus a decagonal pyramid has 2 X 10 = 20 edges.
It has 20 edges.
Volume = 4000 m3
A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges
Volume = 1/3*252*20 = 4166 and 2/3 cubic units
Volume of pyramid = 1/3*base area * height =1/3 * 202 * 10 = 4000/3 = 1333.33... cubic feet
20
It has 20 faces. The number of edges will depend on the exact configuration of the shape. For example, a icosahedron in the form of a prism, with 18-gons as bases, will have 54 edges. On the other hand a pyramid with a 19-gon base will have 38 edges. A bipyramid with a decagon base will have 30 edges. There are very many more possible shapes.
10 I think? * * * * * Sorry, but you think wrong. There are 20.