Cosine Law: SSS Triangle

Math - Grade 9 / Geometry

Sample Question

Given the lengths of the three sides, a, b and c of ΔABC, which of the following is the formula to solve for angle A?

  • [% cosA=\frac{b^2+c^2-a^2}{2bc} %]
  • [% cosA=\frac{b^2-c^2-a^2}{2bc} %]
  • [% cosA=\frac{b^2+c^2-a^2}{2ac} %]
  • [% cosA=\frac{b^2+c^2-a^2}{2ab} %]

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Quipper School Philippines Curriculum

Math - Grade 9

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