In the triangle abc, this angle is a = 90 °, angle b = 60 °, ac = 9. Find the AB side.
| December 6, 2020 | education
Angle c = 30 °, because 90-60 = 30 => BC = 18 cm, then we define the second leg according to the Pythagorean theorem: a ^ 2 + b ^ 2 = c ^ 2 -> a = √c ^ 2 -b ^ 2 = √18 ^ 2 -9 ^ 2 = √324-81 = √243 cm
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