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One of the internal angles of the rhombus is 120°, and the shorter diagonal is 3.4 meters long. Find the perimeter of the rhombus.

Correct answer:

p =  13.6 m

Step-by-step explanation:

B=120  B2=B/2=120/2=60  BD=3.4 m  cosB/2=aBD/2  a=cosB2BD/2=cos60° BD/2=cos60° 3.4/2=0.53.4/2=3.4 m  p=4 a=4 517=54 17=568=568 m=13.6 m

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