©2026 数学クラブ http://sugaku.club/
月 日（ ）
● ∠xを求めなさい． [282-00]
|
(1)
120° x 50° 70° 50° 30° |
(2)
x 70° 40° 110° 70° |
|
(3)
70° 30° 30° 70° x 30° |
(4)
30° x 40° 40° 40° 30° |
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
|
(1)
120° x 50° 70° 50° 30° 六角形の外角の和＝360° ∠x=360-(120+50+70+50+30)=40° |
(2)
x A 70° 40° 110° 70° 五角形の外角の和＝360° ∠xの外角を∠Aとする． ∠A=360-(70+40+110+70)=70° ∠x=180-∠A=110° |
|
(3)
70° 30° 30° 70° x 30° 七角形の外角の和＝360° ∠x=360-(70+90+30+30+70+30)=40° |
(4)
30° x 40° 40° 40° 30° 七角形の外角の和＝360° ∠x=360-(90+30+40+40+40+30)=90° |
- (1)
- ∠x=40°
- (2)
- ∠x=110°
- (3)
- ∠x=40°
- (4)
- ∠x=90°