Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 232
— c). Q.E.F. Keasons 7. § 309. 8. § 309. Ex. 833. Find the area of a triangle whose sides are 7, 10, and 13. Ex. 834. If the sides of a triangle are a, 6, and c, write the formulafor the altitude upon h ; upon c. (See Prop. IV, Arg. 7.) Ex. 835. In triangle ABC, a = 8, 6 = 12, c = 16 ; find the… … A b Given A ABC, with area T, sides a, by and c, and radius ofinscribed circle r. To prove r= ^ {a + b + c)T, Outline of Proop 1. Area of A OBC=:\ a • r; area of A OCA = i- 6 . r; areaoi AOAB = \ c-r. 2. ., T^^{a + h + c)r. q.e.d. 492. Cor. The area of any polygon circumscribedabout a circle is…
Geometry, Plane · Geometry, Solid
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