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The sides of a traingle are 3, 4 and 5 cm. What are the angles of the triangle

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asicannot | Student, Kindergarten | eNoter

Posted June 4, 2013 at 5:37 AM via web

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The sides of a traingle are 3, 4 and 5 cm. What are the angles of the triangle

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 4, 2013 at 5:42 AM (Answer #1)

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The sides of the triangle are 3, 4 and 5 cm. It should be noted that 3^2 + 4^2 = 9 + 16 = 25 = 5^2. This is a right triangle.

As a result one of the angles of the triangle is 90 degrees. If one of the other angles is taken to be x, sin x = 4/5 = 0.8 or `x = sin^-1(0.8) ~~ 53.13` degrees. The third angle is` 90 - 53.13 ~~ 36.86` degrees.

The angles of the triangle are 90, 53.13 and 36.86 degrees.

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