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What is the area of the triangle 10 13 12

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)