Adina is constructing a line perpendicular to yj . she has already constructed two arcs as shown. she moves her compass point to y to construct an arc above the line. what must be true about the width of adina’s compass opening before she draws the arc? a. it must be narrower than it was when constructing the first two arcs.                          b. it must be the same as it was when constructing the first two arcs. c. it must be wider than it was when constructing the first two arcs.