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4a=10cm / :4
a=2,5cm
L=40°
B=180°-40°=140°
zad2.
180°= x+(x+40°)
180°-40°=2x
2x=140°
x=70° 70°+40°=110°
odp. 70° i 110°
zad3.
L=5B
180°=L+B
180°=5B+B
180°=6B / :6
B= 30° L=5 x 30°= 150°
odp. 30° i 150°