Sam is designing a fence post for his yard. He will need to construct a perpendicular line through the point above the line to m
ake sure the fence post is perpendicular to the ground. Which step should Sam do first to ensure that the fence post model is perpendicular to the ground in the diagram? A. Place the compass at the point off the ground, and swing an arc on either side of the point.
B. Place the compass at the point off the ground, and swing arcs above and below the ground.
C. Place the compass at the point off the ground, and swing an arc that intersects the ground in one place.
D. Place the compass at the point off the ground, and swing an arc that intersects the ground in two places.
D is correct. The idea here is to ensure that the point on the post is equidistant from the bottom of the post (where it meets the ground), which in turn ensures that the angle between ground and post is 90° in at least two places on the ground.
