Question 12
Eight planks make one goat pen as pictured. What is the minimum number of planks needed for four pens for four goats?
Intended construction model made explicit: four congruent square pens stand on one level in an edge-connected square-grid arrangement. A shared rail or corner post is used once. Each of the four rails and four upright posts shown counts as one plank.
Intended construction model made explicit: four congruent square pens stand on one level in an edge-connected square-grid arrangement. A shared rail or corner post is used once. Each of the four rails and four upright posts shown counts as one plank.