(1)
x 40° 60° 80° 70° |
(2)
100° 40° 50° 50° x |
(3)
x 30° 100° 70° 30° 30° 30° |
(4)
70° 100° x 40° 30° |
(1)
x 40° 60° 80° 70° 五角形の外角の和=360° ∠x=360-(40+60+80+70)=110° |
(2)
100° 40° 50° 50° x A 六角形の外角の和=360° ∠xの外角を∠Aとする. ∠A=360-(90+100+40+50+50)=30° ∠x=180-∠A=150° |
(3)
x 30° 100° 70° 30° 30° 30° 七角形の外角の和=360° ∠x=360-(30+100+70+30+30+30)=70° |
(4)
70° 100° x A 40° 30° 六角形の外角の和=360° ∠xの外角を∠Aとする. ∠A=360-(70+90+100+40+30)=30° ∠x=180-∠A=150° |