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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=BD/2a  a=BD/2cosB2°=BD/2cos60° =3.4/2cos60° =3.4/20.5=3.4 m  p=4 a=4 3.4=685 m=13.6 m

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