Answer:
m<4=90
Explanation:
Because there are four sides to the shape, it is a quadrilateral. All quadrilaterals have 4 angles and the angles will all add up to 360. You know that two of the angles already is 180 degrees so there is 180 degrees left. There are only two angles left and they are equal to each other so you can tell that the two angles are both 90 degrees because they are equal to each other and they add up to 180.