(1)
80° x 110° 150° 140° |
(2)
x 100° 100° 150° 150° |
(3)
130° 110° 150° x 120° 150° |
(4)
x 70° 150° 110° 130° |
(1)
80° x 110° 150° 140° ∠x=720-(80+110+90+150+140)=150° |
(2)
x 100° 100° 150° 150° ∠x=720-(90+100+100+150+150)=130° |
(3)
130° 110° 150° x 120° 150° ∠x=900-(130+110+150+120+90+150)=150° |
(4)
x 70° 150° 110° 130° ∠x=540-(70+150+110+130)=80° |