The sum of all the angles of the triangle is 180 °.
Using this rule and knowing the magnitude of the other two angles, we can find the third.
1) Based on this, we find the value of the third angle of the triangle:
180 – 58 – 69 = 53 ° – the value of the third angle of the triangle.
ANSWER: The third angle of the triangle is 53 °.
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