Even if it was a right angle, I think a second assumption is that the top left and bottom lines are equal length, which is also not stated.
I think there’s just not enough information in this picture to calculate the angle, and it can only be determined by measuring. But the image also does not specify that it is drawn to scale.
the lengths are irrelevant. the only info you need to solve this is that a triangle’s internal angles add to 180, and angles on a straight line add to 180
Even if it was a right angle, I think a second assumption is that the top left and bottom lines are equal length, which is also not stated.
I think there’s just not enough information in this picture to calculate the angle, and it can only be determined by measuring. But the image also does not specify that it is drawn to scale.
the lengths are irrelevant. the only info you need to solve this is that a triangle’s internal angles add to 180, and angles on a straight line add to 180