Construct a copy of segment AB onto the ray below. Call your new segment: segment A'B'
Construct a copy of the line segment AB from the triangle onto the ray. Name the copy segment PQ
Copy each segment endpoint to endpoint.
Construct segment MN such that MN=2AB
Construct segment DE whose length is equal to the perimeter of the triangle below.
Construct segment GH which is the sum of the segments shown.