A complete and practical solution book for the common school teacher (1899)
Fairchild, J[ohn] T[heodore] [from old catalog] · Crawfis College, Ohio, The author · leaf 152
FIG. MENSURA TION. 137 … FIG. 4. (AB X AC)(AB + AC)5 Let ABC be the given right-angled tri-angle. Produce AC to E, making CE =AB. At E draw ED perpendicular to CEand make it equal to AC. Draw DC andBD; then CD = CB and A BCD = ^BC2.TheareaofABDEisequalto|AE(AB+ED)or |(AB + AC)2; it is also equal to|(BCxCD) +twice the A ABC…
Arithmetic · Geometry
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