Books Books 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. A Treatise on Mensuration, Both in Theory and Practice - Page 91
by Charles Hutton - 1788 - 703 pages ## A Geometry for Beginners

George Anthony Hill - Geometry - 1880 - 314 pages
...number of linear units in the base by the number of linear units in the altitude. Or, more briefly : The area of a rectangle is equal to the product of its base by its altitude. If the area and base are known, how can the altitude be found? If the area and... ## Elements of Geometry

George Albert Wentworth - 1881
...= ) is to be read " equal in area." R a' К a' 1 GEOMETRY. BOOK IV. PROPOSITION III. THEOREM. 319. The area of a rectangle is equal to the product of its base and altitude. \ U b 1 Let IÍ be the rectangle, b the base, and a the altitude ; and let U be... ## The Complete Arithmetic, Oral and Written, on the Basis of Works

Henry Bartlett Maglathlin - Arithmetic - 1882 - 368 pages
...1 square inch each ; and 2 such rows contain 2 times 3 square inches, or 6 square inches. That is, The area of a rectangle is equal to the product of its length and breadth, taken in the same denomination. Also, One of the dimensions of a rectangle is equal to the area divided... ## The Elements of Plane and Solid Geometry: With Chapters on Mensuration and ...

Isaac Sharpless - Geometry - 1882 - 266 pages
...AB, have to each other the same ratio. Hence AFH : ADG :: AFxAH : ADxAG. Proposition 16. Theorem. — The area of a rectangle is equal to the product of its adjacent sides. Let AC be a rectangle ; its area is equal to the product of AB and BC. GEOMETRY.—... ## Fish's Arithmetic Number One[-two]: Oral and Written ..., Volume 2

Daniel W. Fish - Arithmetic - 1883
...of each rectangle. The units' figure of the root is equal to the width of one of these rectangles. The area of a rectangle is equal to the product of its length and width (Í2 15); hence, if the area be divided by the length, the quotient will be the 20 400 width.... ## Fish's Arithmetic Number Two: Oral and Written, Upon the Inductive ..., Book 2

Daniel W. Fish - Arithmetic - 1883 - 352 pages
...of each rectanple. The units' figure of the root is equal to the width of one of these rectangles. The area of a rectangle is equal to the product of its length and width (2 15); hence, if the area be divided by the length, the quotient will be the width. Now, since... ## Essentials of Geometry

Alfred Hix Welsh - Geometry - 1883 - 267 pages
...ab : a'b'. Q. E . D. QUERY. What Problem of Ch. V is involved in the construction of R"? THEOREM IV. The area of a rectangle is equal to the product of its base by its altitude. R 4 6' Let R be any rectangle with base b and altitude a. Upon any assumed base,... ## Elementary Geometry: Including Plane, Solid, and Spherical Geometry, with ...

Edward Olney - Geometry - 1883 - 333 pages
...of their bases by their altitudes. 349. SCHOLIUM.—The arithmetical signification of the theorem, The area of a rectangle is equal to the product of its txixe, and altitude, is this: Let the base be 6 and the altitude a; then we have, by the proposition,... ## The Eclectic School Geometry: A Revision of Evan's School Geometry

Evan Wilhelm Evans - Geometry - 1884 - 155 pages
...XII); that is, the two diagonals bisect each other in E. Therefore, the diagonals, etc. THEOREM XXIII. The area of a rectangle is equal to the product of its base by its altitude. Let ABCD be a rectangle. It D c is to be proved that its area is equal to the... 