Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 239
circular ring: that is, the area in-cluded between the circumferences of two circles, having acommon centre. RULE. I. Square the diameter of each ring, and subtract *he squareof the less from that of the greater. II. Multiply the difference of the squares by thb d ximai7854, and the product will be… … Difference = 64Then, 63 X.7854 = 50.2656=area. 2. What is the area of the ring when the diameters of thecircle aie 20 and 101 Ans. 235.62. OF GEOMETRY. 23<J Mensuration of Solid 3. If the diameters are 20 and 15, what will be the area in-cluded between the circumferences ? Ans. 137.445. 4. If…
Geometry · Plane trigonometry
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