Idon't understand how to show my work for 19% of 72 estimated

How do i solve using pythagorean theorem?

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

Draw a scaled copy of the circle using a scale factor of 2