The radius of the base of a solid cone is 21 cm and its height is 9 cm. What is the volume of the cone?
A1980 Cm³
B5940 Cm³
C4158 Cm³
D1386 Cm³
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ഒരു സമപാർശ്വ ത്രികോണമായ ABCയിൽ, AB = AC = 26 cm ഉം BC = 20 cm ഉം ആണെങ്കിൽ, ABC ത്രികോണത്തിന്റെ വിസ്തീർണ്ണം കണ്ടെത്തുക.