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3. x = 1/6(180° - x)
6x = 180 - x
6x + x = 180
7x = 180°
x = 180/7 °
= 25 5/7 °
= 25,71°
4. x = 3/8(180° - x)
8x = 3(180° - x)
= 540° - 3x
8x + 3x = 550°
11x = 540°
x = 540°/11
= 49 1/11°
= 49,1°
b. 180° - 49 1/11 ° = 130 10/12°
= 130,9°
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