Mathematics
Senior High
Solved
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答えは③です！
[問18] △ABC で AB=AC=x, BC=2, ∠ABC=36°とする。
辺BC上に∠CAD = 36° となる点Dを取ると BD = x, CD = 2-x となる。
このときxの値は、次のうちのどれか。
A
B
36°
1360
D
√5-1
√5+1
√5+1
(3)
√5-1
⑤ √5 +1
√5+1
2
4
Answers
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