Perimeter of triangle ABC = 15. what is the area of triangle?
1) BC = 7
2) Angle ABC = 70 degree.
C) - (two equations - 1 We can use Cosine rule to find the two sides AND
2 a+b=15-7=8;
OA C
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The answer is correct' but you will never have to use cosine, sine, tangent or cotangent trigonometry principles on the GMAT.
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