Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 231
C a B D C Given A ABC, with sides a, &, and c. To derive a formula for the area of A ABC in terms of a, b, and c. Argument Reasons 1. Let h^ denote the altitude upon a, p the pro- 1. § 485. jection of b upon a, and T the area ofA ABC. . Then T=\ah, = %^.2 2 2. \^=:W-p = (b-\-p){b-p), 3. Butp =…
Geometry, Plane · Geometry, Solid
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