Question

Arun is constructing a triangle DEF congruent to triangle PQR.

An acute scalene triangle PQR.

He marked a point D and adjusted the width of the compass to the length of PR and drew an arc from point D. He marked a point F on the arc. He then adjusted the width of the compass to the length of half of PQ and drew an arc from point D. What error did Martha make in these steps?
Answer

Making an arc instead of a circle.

Not using a ruler to measure QR.

Making an arc instead of line segment with a ruler.

Not adjusting the width of the compass to the length of PQ.