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51.
If the radius of the circumcircle of an equilateral triangle is 8 cm,
then the measure of radius of its incircle is:
यदि किसी समबाहु त्रिभुज के परिवृत्त की त्रिज्या 8 सेमी. है, तो इसके अंत:वृत्त की त्रिज्या होगी:
(A) 8cm./ सेमी.
(B) 12 cm./ सेमी.
(C) 16 cm./ सेमी.
(D) 4cm./ सेमी.
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