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(1)
80° 30° 70° x 30° 30° |
(2)
60° 30° 80° 60° 60° x 30° |
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(3)
80° 60° 40° 60° x 30° 30° |
(4)
40° 50° 80° 40° 30° x |
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(1)
80° 30° 70° x A 30° 30° 七角形の外角の和=360° ∠xの外角を∠Aとする. ∠A=360-(80+30+90+70+30+30)=30° ∠x=180-∠A=150° |
(2)
60° 30° 80° 60° 60° x A 30° 七角形の外角の和=360° ∠xの外角を∠Aとする. ∠A=360-(60+30+80+60+60+30)=40° ∠x=180-∠A=140° |
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(3)
80° 60° 40° 60° x 30° 30° 七角形の外角の和=360° ∠x=360-(80+60+40+60+30+30)=60° |
(4)
40° 50° 80° 40° 30° x 七角形の外角の和=360° ∠x=360-(40+50+90+80+40+30)=30° |