✨ Best Answer ✨
根據外角定理，∠4+∠5=紅色角，
同理，∠3+紅色角=橘色角，
∠2+橘色角=黑色角，
∠1+黑色角=180(L1//L2，同側內角互補)，
故∠1+∠2+∠3+∠4+∠5=180
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✨ Best Answer ✨
根據外角定理，∠4+∠5=紅色角，
同理，∠3+紅色角=橘色角，
∠2+橘色角=黑色角，
∠1+黑色角=180(L1//L2，同側內角互補)，
故∠1+∠2+∠3+∠4+∠5=180
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