Adherence to right angles is a must when building walls. Drawing a right angle on paper is not too complicated, for example using a triangle with a line. There are also masonry angles, but due to the dimensions they are not always accurate enough.
Every good bricklayer can draw a right angle with the help of an ordinary string. He will help himself with the Pythagorean theorem! Every triangle has a right angle against its longest side, the lengths of which are in the so-called Pythagorean ratio. Measuring a length is much easier than measuring an angle.
An angle is a part of a plane bounded by two half-lines with a common beginning.
Acute angle
Right angle
Straight angle
Obtuse angle
Hollow angle
Types of triangles according to the size of internal angles
Sharp – all interior angles are sharp
V – is as an interior point
Rectangular – just one inner angle is a right
V – coincides with the vertex of the right angle
Obtuse – just one inner angle is obtuse
V – has as an outer point