Mathematics
Junior High
半径の求め方教えてください
答えは（3）60/17 (4) √3/2
と、 AF (=3cm) と IF の比は3:1だから.
B, △IBC, ICD, △IDA の面積と四角形ABCD
2
5 cm,
5 cm
12cm
12 cm
□(4)
2 cm
060°
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