Your missing the angle of elevation or depression.
9.3
An angle that measures 210 degrees is a reflex angle.
The angle of depression is looking at an object below your line of sight.
The third angle measures 18 degrees.
Angle of elevation is looking upwards to an object and angle of depression is looking downwards to an object
There's the protractor, a bevel gauge, and the plain ol' measuring tape with pen and paper.Inclinometer.
It is the alternate angle to the angle of elevation
The angle of depression is the same as the angle of elevation because they are alternate angle so use the tangent ratio:- 10*tan(25) = 4.663076582 or 4.663 yards to 3 decimal places
Protractors
you could do a model showing the angle of elevation and angle of depression of a building
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A sextant.the sextonan astrolabe
Some of the devices used to measure angle are Transit, Protractor and Compass.
A sextant measures the angle of elevation between the horizon and the north star. Along with charts, it can be used to calculate your position on the sea fairly accurately.
It can be any object that is above or below the horizontal from the perspective of a viewer.
A protractor is commonly used on two-dimensional renderings.