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2α + 110°=180°
2α = 180°-110°
2α = 70° /:2
α=35°
b)
P=1/2 ·A·h
P=28
A=2a
h=7
28= 1/2 ·2a·7
7a=28 /:7
a=4
c)
2α+α =180°
3α =180° /:3
α = 60°
d)
2β + 4β + 210° =360°
6β = 360° - 210°
6β = 150° /:6
β = 25°
2b+110=180
2b=70/:2
b=35
b)
P=1/2 ah
28=1/2*2a* 7
28=7a
a=4
c)
a+2a=180
3a=180/:3
a=60
d)
2b+4b+210=360
6b=360-210
6b=150/:6
b=25