✨ ベストアンサー ✨
13.
三角形ABC和三角形EDC相似(AA)
AB : ED = AC : EC = 4 : 1
EC = AC/4
sinB = sin角CDE = EC/CD = (AC/4)/(AC/3) = 3/4
14.
令角POA為θ
AT = tanθ = 3/4
PQ = sinθ = 3/5
OQ = cosθ = 4/5
所求 = 2(3/5 + 4/5) = 14/5
✨ ベストアンサー ✨
13.
三角形ABC和三角形EDC相似(AA)
AB : ED = AC : EC = 4 : 1
EC = AC/4
sinB = sin角CDE = EC/CD = (AC/4)/(AC/3) = 3/4
14.
令角POA為θ
AT = tanθ = 3/4
PQ = sinθ = 3/5
OQ = cosθ = 4/5
所求 = 2(3/5 + 4/5) = 14/5
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