# The Lawnmowers (Harmonization of Noise Emission Standards) Regulations 1992, Paragraph 8.3: Calculation of the area S of the measuring surface


In the case of a hemisphere, the area S, expressed in m2, of the measuring surface is determined as follows:
S=2πr2 where
r = the radius of the measuring hemisphere in m.

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Source: https://www.legislation.gov.uk/uksi/1992/168/schedule/3/paragraph/8.3 (the official version)
Page: https://openlegislation.uk/lawnmowers-harmonization-of-noise-emission-standards-regulations-1992/schedule-3/paragraph-8.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.