They are used to support other elements of the structure as well as to divert the load to support columns which are usually based in the bed rock.
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Measuring plots of land. Using the 3-4-5 triangle to measure out right angles (for building).
Using a protractor is the simplest way of solving the measurements of angles.
using protactor, we use to draw angles in anticlockwise direction and that angles are called positive quadrant angles. and angles in clockwise direction, these angles are called negative quadrant angles.
by using a protractor
By using trigonometry