The construction of altitude ad for triangle def is shown below.

which step in the construction of the altitude assures that ad is perpendicular to ef?

place the compass on vertex d and adjust the width so that the drawn arc goes past side ef.
draw an arc to intersect side ef twice.
from each intersection point, draw an arc above side ef so that the two arcs cross.
draw a line from vertex d to point a to create altitude ad.

Step-by-step explanation:

In the image attached, the two arcs crossing represent the demonstration of segment AD as perpendicular.

Therefore, the right answer is the third choice.

First, we have to draw to arcs across the line that create two points.

Then, from those points, we draw two intersecting arcs.

At the ends, we draw a line intercepting the two intersecting arcs.

That's why choice C is the right answer.

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step-by-step explanation: