(1)
70° 50° x 120° 30° |
(2)
60° x 110° 50° 40° 30° |
(3)
30° 80° x 130° |
(4)
x 40° 110° 30° 30° 30° 30° |
(1)
70° 50° x 120° 30° 五角形の外角の和=360° ∠x=360-(70+50+120+30)=90° |
(2)
60° x 110° 50° 40° 30° 六角形の外角の和=360° ∠x=360-(60+110+50+40+30)=70° |
(3)
30° 80° x A 130° 五角形の外角の和=360° ∠xの外角を∠Aとする. ∠A=360-(30+80+90+130)=30° ∠x=180-∠A=150° |
(4)
x A 40° 110° 30° 30° 30° 30° 七角形の外角の和=360° ∠xの外角を∠Aとする. ∠A=360-(40+110+30+30+30+30)=90° ∠x=180-∠A=90° |