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There are three arches in the foot, not one. They are the medial longitudinal arch, the lateral longitudinal arch, and the transverse arch. The ML goes from heel to hallux (heel to big toe), the LL goes from the heel to the little toe, and the TA goes across the bottom of them. There is just 1 arch in a foot check out this websit to learn more: http://orthoinfo.aaos.org/fact/thr_report.cfm?Thread_ID=381&topcategory=Foot
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The four foot arches refer to the structures that help maintain the foot's shape and support weight during standing and movement. These include the medial longitudinal arch, lateral longitudinal arch, anterior transverse arch, and posterior transverse arch. The medial and lateral longitudinal arches run from the heel to the toes, while the transverse arches span across the foot. Together, these arches distribute body weight and absorb shock, contributing to overall foot function and stability.
nine
Nine of them exist in a square yard and 144 square inches equala a square foot.
four
Shape. A square foot is any area of 144 squinches. A linear square foot, should such a name exist, would probably be a square 12 inches to the side.