Mathematics
Senior High
Resolved
【至急!】(1)(2)(3)出来れば解説お願いします。
△ABCにおいて,
a
=
=√21, 6 = 4, A = 60°
であるとき,次の問いに答えよ。
(1)△ABCの外接円の半径R を求めよ。
(2) cを求めよ。
(3)△ABCの面積Sを求めよ。
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