Answer:
It's a isosceles triangle, i am not saying its clearly implied in the diagram with the red lines.... Which state that both the sides have same length
Hence if on ne side makes 55 with the base therefore the side with same length will make 55 with the base too
Hence its
55+55+x=180
X= 180-55-55
X= 70 degree
Therefore x is 70 degree
