Answer:
3.ABC is an isosceles triangle ,
x + x+ 42 = 180
2x + 42 = 180
2x = 180 - 42
2x = 138
x = 138/2
x = 69
4.
Sum of 2 interior angles = exterior angle
x + 58 = 102
x = 102 - 58
x = 44
Hope u understand
Explanation:
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