Circum Radius from Properties of triangle

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Nice i am very very satisfied with your derivation..
Thanks a lot i was very nervous that how can i found the radius of circumcene.
But now i am happy with your derivation...

abhishekkr.
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Hi, what is small letter "a" at 4:46

oneinabillion
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what is the meaning of s in the formula to find delta??

hirawahab
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