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2. Mortar (masonry) - Wikipedia

   en.wikipedia.org/wiki/Mortar_(masonry)

   Mortar is a workable paste which hardens to bind building blocks such as stones, bricks, and concrete masonry units, to fill and seal the irregular gaps between them, spread the weight of them evenly, and sometimes to add decorative colours or patterns to masonry walls. In its broadest sense, mortar includes pitch, asphalt, and soft mud or clay ...

3. Ratio - Wikipedia

   en.wikipedia.org/wiki/Ratio

   In mathematics, a ratio ( / ˈreɪʃ ( i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and the ...

4. Ready-mix concrete - Wikipedia

   en.wikipedia.org/wiki/Ready-mix_concrete

   Ready-mix concrete refers to concrete that is specifically manufactured for customers' construction projects, and supplied to the customer on site as a single product. It is a mixture of Portland or other cements, water and aggregates: sand, gravel, or crushed stone. [ 4 ]

5. Golden rectangle - Wikipedia

   en.wikipedia.org/wiki/Golden_rectangle

   In geometry, a golden rectangle is a rectangle whose side lengths are in the golden ratio, : +, which is : (the Greek letter phi), where is approximately 1.618.. Golden rectangles exhibit a special form of self-similarity: All rectangles created by adding a square to a side, or removing a square from an end, of a golden rectangle are golden rectangles as well.

6. Geometric progression - Wikipedia

   en.wikipedia.org/wiki/Geometric_progression

   The first block is a unit block and the dashed line represents the infinite sum of the sequence, a number that it will forever approach but never touch: 2, 3/2, and 4/3 respectively. A geometric progression, also known as a geometric sequence, is a mathematical sequence of non-zero numbers where each term after the first is found by multiplying ...

7. Aspect ratio - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio

   The aspect ratio is most often expressed as two integer numbers separated by a colon (x:y), less commonly as a simple or decimal fraction. The values x and y do not represent actual widths and heights but, rather, the proportion between width and height. As an example, 8:5, 16:10, 1.6:1, and 1.6 are all ways of representing the same aspect ...

8. Course (architecture) - Wikipedia

   en.wikipedia.org/wiki/Course_(architecture)

   Course (architecture) A course is a layer of the same unit running horizontally in a wall. It can also be defined as a continuous row of any masonry unit such as bricks, concrete masonry units (CMU), stone, shingles, tiles, etc. [1] Coursed masonry construction arranges units in regular courses. Oppositely, coursed rubble masonry construction ...

9. Stern–Brocot tree - Wikipedia

   en.wikipedia.org/wiki/Stern–Brocot_tree

   For instance, the continued fraction representation of 13 ⁄ 9 is [1;2,4] and its two children are [1;2,5] = 16 ⁄ 11 (the right child) and [1;2,3,2] = 23 ⁄ 16 (the left child). It is clear that for each finite continued fraction expression one can repeatedly move to its parent, and reach the root [1;]= 1 ⁄ 1 of the tree in finitely many ...