19. यदि AABC तथा ADEF के केन्द्रक क्रमश: G, तथा G,है,
सिद्ध कीजिए कि AD+ BE + CF = 3G,G, जहाँ, बिन्दु D.
तथा F भुजाओं BC,CA तथा AB के मध्य-बिन्दु है। (2011)
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Draw a diagram to show the process of insolation.Draw a diagram to show the process of insolation.
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