Calculate 2

Calculate the largest angle of the triangle whose side are 5.2cm, 3.6cm, and 2.1cm

Correct result:

A =  129.7583 °

Solution:

a=5.2 cm b=3.6 cm c=2.1 cm  a>b>c=>A>B>C  a2=b2+c22bccosA  A1=arccos(b2+c2a22 b c)=arccos(3.62+2.125.222 3.6 2.1)2.2647 A=A1=A1 180π=2.2647 180π=129.758=129.7583=1294530"

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