find the volume & total surface of a square pyramid, the side of the base being 4meters & height 5meters
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triangular prism
There are many options. Some examples:hemisphere,biconvex lens,finite cone.
A ten sided figure is called a Decagon. ( i think that's how you spell it. )
Keeping a solid roofing layer of shingles is an important way to avoid water damage and effects of rain, snow and hail while providing an attractive crown for the house.
It kind of depends on what you are doing and how you want the finished project to look. As a post with the weight or pressure straight down, it really doesn't make a lot of difference. Any side stress, 3 bolted together would always have more strength because of the different grains in the wood going in different directions. A single solid post can snap if there happens to be a flaw that runs all the way through it.