ഒരു സമപാർശ്വ ത്രികോണമായ ABCയിൽ, AB = AC = 26 cm ഉം BC = 20 cm ഉം ആണെങ്കിൽ, ABC ത്രികോണത്തിന്റെ വിസ്തീർണ്ണം കണ്ടെത്തുക.
A180 cm²
B240 cm²
C220 cm²
D260 cm²
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