Pls help me i dont understand pls help

Which math sentence can be used to determine if the triangle is a right triangle?

Miguel’s teacher asks him to color 4/8 of his grid. he must use 3 colors: red, blue, and green. there must be more green sections than red sections. how can miguel color all the sections of his grid to follow all the rules

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?