There is a triangle ABC. Area of the Triangle is 450 m² Angle ACB is 150° Length of BC IS 60m Calculate the perimeter of the triangle and give your answer to 3 significant figures.

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use trig label angle ACB as angle C and length BC as length a (we are finding length c) area formula: 0.5ab(sinC)=Area 0.5(60)(b)(sin150)=450 b=30   use cosine rule c²=a²+b²-2ab(cosC) c²=(60*60)+(30*30)-2(60*30)cos150 c=87.279387 c=87.279 Perimeter: 30+60+87.279 =177.279 checked answer:http://www.wolframalpha.com/input/?i=triangle+side+length+87.279%2C+30%2C+60