Triangle in circle

Vertices of the triangle ABC lies on a circle with radius 3 so that it is divided into three parts in the ratio 4:4:4.

Calculate the circumference of the triangle ABC.

Correct answer:

o =  15.6

Step-by-step explanation:

Φ1=3604+4+44=120 Φ2=3604+4+44=120 Φ3=3604+4+44=120  a=23sin2Φ1=5.2 b=23sin2Φ2=5.2 c=23sin2Φ3=5.2  o=a+b+c=15.6 



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