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The value of sin(30°) is 1/2.
<h3>What is Trigonometry?</h3>The branch of mathematics concerned with specific functions of angles and their application to calculations.
The diagram is attached below:
We know,
sin 30= Perpendicular/ Hypotenuse.
As, the hypotenuse is the opposite side of the right angle and the perpendicular is opposite to the given angle.
So,
sin 30 = 5/10
sin 30 = 1/2
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1 min = 
Now,
Replacing m with
Here it is,
20mm/m = 1200 mm/h
Now,
Replacing m with
Here it is,
20mm/m = 1200 mm/h