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OpenStudy (hulkart):
Use Heron’s Formula, that is, the area of a triangle is , where the triangle contains sides a, b and c and to find the area of the triangle with side lengths: a = 6.2, b = 7.5, c = 4.9. 15.1 square units 18.4 square units 23.3 square units 28.5 square units
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OpenStudy (anonymous):
http://mathworld.wolfram.com/images/equations/HeronsFormula/NumberedEquation2.gif
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