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热心网友
(1)22.5°,(2)15°≤ <18°
∵AA 1 =A 1 A 2 =A 2 A 3 =A 3 A 4 ,∠A 4 A 3 A=90°∴∠A 1 A 3 A 2 =∠AA 1 A 2 ="2θ," ∠A 2 A 3 A 4 =180°-2(90°-θ)= 2θ
∠A 1 A 3 A 2 +∠A 2 A 3 A=90°∴2θ+2θ=90°,θ=22.5°
热心网友
(1)22.5°,(2)15°≤ <18°
∵AA 1 =A 1 A 2 =A 2 A 3 =A 3 A 4 ,∠A 4 A 3 A=90°∴∠A 1 A 3 A 2 =∠AA 1 A 2 ="2θ," ∠A 2 A 3 A 4 =180°-2(90°-θ)= 2θ
∠A 1 A 3 A 2 +∠A 2 A 3 A=90°∴2θ+2θ=90°,θ=22.5°