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I would guess that it is to make a better mortar joint. Mortar is forced into these holes and holds the bricks together better. Also the holes make the bricks lighter and air in the holes acts as insulation. I moved your question out of math to where I hope you will get a definitive answers.
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∙ 13y ago
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Why are hollow bricks good for constructing walls of buildings?
Yes, but . . . There are two kinds of hollow bricks. One is for veneer only, the other is used for structural construction.
Difference between concave and plano concave?
Concave means that it bows inward (a dent instead of a bulge). Planoconcave means that one side is flat and the other side is concave.
Why image on spoon one side is inverted and other side is erect?
because one side is concave and the other is convex
Which mirror used for magnified image of your face?
A slightly concave mirror will produce a magnified image. Most shaving mirrors have one flat side and one concave side. Try looking in each side to find the one that magnifies.
How do you draw concave lens?
The shape of a concave lens is such that the middle part is thinner than the edge. If one side of the lens is flat, then the other side will be shaped inward like a cave, kind of like this: [( You can also have a concave lens where both sides are shaped inward, like this: )( You can even have a concave lens where one side is shaped outward, and the other side is shaped inward, as long as the inward-shaped side is more dramatic than the outward-shaped side.
Which shapes are concave?
Some examples of concave shapes include a crescent moon, a cave entrance, and the letter "C". Concave shapes have at least one inward curve or indentation and are often described as having a hollow or sunken appearance.
How does concave graph look like?
Many graphs that appear concave from one side will appear convex from the other. A smooth graph is generally described as concave if it is increasing AND if the rate of increase is also increasing. In terms of calculus this requires the first and second derivative to be positive. A concave polygon is one in which at least one of the vertices forms a reflex angle.
Do mirrors sometimes make things look bigger than they really are?
They can if they are curved inward (concave). We frequently see this in make-up mirrors that have a flat, or "regular" side, and a concave side that magnifies the image one sees in it.
What do you mean by convex mirror and concave mirror?
concave and convex refer to the curve of the mirror. if it is concave, it curves in at the middle, like a 'cave'. if it is convex, it curves out at the middle, like an eye. think of a spoon - one side is convex, the other is concave. this curve will affect the image the mirror shows.
How do you describe magnifying glass?
It's just like eye glasses. One side is concave and the other side is convex. And when you look though it it makes things bigger.
Which light rays striking a concave mirror are reflected so that they pass through the focal point?
The tendency in case of concave lens would be diverging one. When parallel rays fall one side of the concave lens then due to divergence they appear to come, note down that "they appear to come" from a point on the same side. And this point is named as the virtual focus of the concave lens. Now as a ray passes through this virtual focal point that will be definitely a diverging one. Now due to diverging action of the lens, that ray will be further diverged and that will appear to come from a virtual point on the same side and some what nearer to the concave lens. Hence the image will be virtual and diminished and erect one.
How much is one thousand bricks?
1000 bricks
