How do I get the result for 1/8 out of 40?

What term makes it inconsistent y=2x - 4

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m

Consider circle o, where and . m∠bpd °. °.