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" The area of a rectangle is equal to the product of its base and altitude. Given R a rectangle with base b and altitude a. To prove R = a X b. Proof. Let U be the unit of surface. .R axb U' Then 1x1 But - is the area of R. "
First Lessons in Geometry: With Practical Applications in Mensuration, and ... - Σελίδα 32
των Charles Davies - 1840 - 252 σελίδες
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