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(1)∠1=180°-(90°+30°)
=180°-120°
=60°;
(2)∠2=180°-(20°+35°)
=180°-55°
=125°;
(3)∠3=180°-(40°+60°)
=180°-100°
=80°;
∠4=180°-∠3
=180°-80°
=100°.
=180°-120°
=60°;
(2)∠2=180°-(20°+35°)
=180°-55°
=125°;
(3)∠3=180°-(40°+60°)
=180°-100°
=80°;
∠4=180°-∠3
=180°-80°
=100°.
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