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280 GNITAKARARAGRAHA, produot is diminished by the measure of the interval between the wall and the style. 'The difference (eo obtained) is divided by the very measure of the human shadow (referred to above). The quotient so obtained happens to be the measure of (that portion of) the style's shadow which is on the wall. An enwple in thu8trution heref 22. A pillar is 20 hrst8 (in height) ; the interval bstween (this) pillar and the wall (on which its shadow falls) is 8 hasta8, IThe human shadow (at the time) i8 twice (the man's height). What is the measure of (that portion of) the pillar-shadow which is on the wall ? The rule for arriving at the numerical value of the measure = ment of the interspace between a wall and a pillar, when the height of the pillar aud the numerical value of (that portion of) the shadow thereof which has fallen upon the wall are (both) known, 23. I'he difference between the height of a pillar and that (of its shadow) cast on (a wall), multiplied by the measure of the human in terms the man's height), gives rise to the shadow (of measure of the interspace between that (pillar) and that (wall). This value of the interspace divided by the difference between tho height of the pillar and that of (the portion of) the shadow thereof oast on (the wall), gives rise to the measure of the human shadow (in terms of the man's height) . An example in illustration thereof. 24. A pillar is 20 hosta8 (in height); and the (portion of ite) shadow on a wall is 16 (hasta in height). IThe human shadow (at bhe time) is twice (the human height. What may be the measure of the interspace between the pillar and the wall ? 28. This rule and the one n stania 28 following givo the converse ooses of the rule in stana 21 above.