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Parker cuts 12 pentagons and 20 hexagons out of fabric to make the pillow shown. The pillow has 60 vertices. If it takes 20 inches of thread per seam to connect the edges of the polygons, how many inches of thread does Parker need to make the pillow?

Answer :

Final answer:

Parker would need 3600 inches of thread to sew the edges of the 12 pentagons and 20 hexagons together to make the pillow.

Explanation:

The calculation of the total thread needed is based on understanding how many edges exist in the 12 pentagons and 20 hexagons. A pentagon has 5 edges and a hexagon has 6 edges. Therefore, the number of total edges that Parker needs to sew equals the number of pentagons multiplied by the number of edges in a pentagon, plus the number of hexagons multiplied by the number of edges in a hexagon.

This gives 12 pentagons * 5 edges/pentagon + 20 hexagons * 6 edges/hexagon = 60 + 120 = 180 edges.

Since it takes 20 inches of thread to sew each edge, the total amount of thread needed would be 180 edges * 20 inches per edge = 3600 inches.

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