Calculate 2

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

Correct answer:

A =  129.7583 °

Step-by-step explanation:

a=5.2 cm b=3.6 cm c=2.1 cm  a>b>c => A>B>C  a2 = b2+c2  2bc cos A  A1=arccos(2 b cb2+c2a2)=arccos(2 3.6 2.13.62+2.125.22)2.2647 A=A1  °=A1 π180   °=2.2647 π180   °=129.758  °=129.7583=129°4530"

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