Explanation:
The angle at W plus the 144 degree angle form a 180° ( straight line)
so that angle is 36°
the three angles inside the triangle = 180 °
36° + 6x+1 + 7x = 180 °
13x = 143
x = 11°
Answer:
x = 11.
The sum of the 2 base angles = 144 (external angle of a triangle theorem)
So,
6x + 1 + 7x = 144
x = 143/13 = 11,
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