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Lsgtiga= √s(s-a) (s-b) (s-c)
Lsgtga= √27(27-20) (27-21) (27-13)
Lsgitiga= √27x7x6x13
Lsgitiga= √15876= 126
R= abc/4L
= 20x21x13/4x126
=5460/504 = 10,33 cm
semoga membantu :)