Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 277
eet in rolling 44 yards ? Ex. 1004. (a) Find the width of the ring between two concentriccircumferences whose lengths are 2 feet and 8 feet, respectively. (&) Assuming the earths equator to be 25,000 miles, find the widthof the ring between it and a concentric circumference 1 foot longer. (c)… … Given regular polygon ABCD • •apothem. To prove area of ABCD . . • = ^ P r. Argument 1. In polygon ABCD • •«, inscribe a circle. 2. Then r, the apothem of regular polygon ABCD. • •, is the radius of circle 0. 3. .-. area of ABCD -- - = ^ P r. q.e.d. P its perimeter, and r its Reasons 1. § 530. 2. §…
Geometry, Plane · Geometry, Solid
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