What is the purpose of bull marks , How to check Levels , How to check Right angels ?

Question

Accepted Answer

Bull marks are used to indicate the centerline of a road or building. Levels are checked using a level instrument. Right angles are checked using a square tool.

Bull marks are used to ensure that the centerline of a road or building is accurate.
Levels are checked using a level instrument to ensure that the ground is level and the building or road is constructed at the correct height.
Right angles are checked using a square tool to ensure that corners are square and the building or road is constructed at the correct angle.
Bull marks are usually made using a chalk line or a laser level.
Levels can be checked using a spirit level or a digital level.
Right angles can be checked using a framing square or a try square.

What is the purpose of bull marks , How to check Levels , How to check Right angels ?

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