4a.
180° = 3x +2x
180° = 5x
x= 180/5
x=36°
4b.
3x=3×36=108°
4c.
2x=2×36=72
5a.
180°=2a+3a+85
180-85=5a
95=5a
95/5=a
a=19°
5b.
2a=2×19=38°
5c.
3a=3×19=57°
6a.
90°=2y+y+30
90-30=3y
60=3y
60/3=y
y=20°
∠POQ=2y=2×20=40°
6b.
∠QOR=y+30=20+30=50°
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4a.
180° = 3x +2x
180° = 5x
x= 180/5
x=36°
4b.
3x=3×36=108°
4c.
2x=2×36=72
5a.
180°=2a+3a+85
180-85=5a
95=5a
95/5=a
a=19°
5b.
2a=2×19=38°
5c.
3a=3×19=57°
6a.
90°=2y+y+30
90-30=3y
60=3y
60/3=y
y=20°
∠POQ=2y=2×20=40°
6b.
∠QOR=y+30=20+30=50°