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24-03-2017
Mathematics

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what is the measure of the greatest angle of a triangle if the side lengths are 21m, 23m, and 25m

Respuesta :

25-03-2017

cosA=(21^2+23^2-25^2)/2*21*23
cosA=345/966
A=cos^-1(345/966)
A=69.08

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