ARITHMETIC GLOSSARY
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Title  Description  

Height  Altitude. How tall something is, measured in some perpendicular fashion to the "bottom" is its height. 

Horizontal  Horizontal comes from orientation like the horizon; parallel to the "flat" surface of the earth; perpendicular to vertical. 

Hypotenuse  The longest side of a right triangle is the Hypotenuse; it is always opposite the 90degree angle (or right vertex). 
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