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Jiangxi senior high school entrance examination mathematics examination paper
(3)∫a 1 a2 = aa 1

∴θ 1=∠A2A 1A3=2θ,

∴θ2=∠A2A4A3=θ+2θ=3θ,

∴θ3=∠A2A4A3+θ=4θ,

So the answer is θ 1=2θ, θ2=3θ, θ3=4θ,

(4) According to the meaning of the question, 5 θ ≤ 90.

{

6θ>90 ,

∴ 15 ≤θ< 18 .