Odpowiedź:
zadanie 6
30°-y+20°+y+3y+40°=180°/ - 30°
-y+20° +4y +40°=150°/ - 20°
-y+4y+40° = 130°
3y+40°=130/-40
3y= 90/3
y= 30
30- 30 = 0
20 + 30 = 50
90 +40 = 130
zadanie 7
3,5 m= 350 cm
350cm - 75 cm = 275 cm
75/275 = 3/11
