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2β+110°= 180°
2β=180°-110°
2β=70°/:2
β=35°
b)
P=1/2 ah
28cm²= 1/2 * a *7cm
28cm²=7/2 a /:7/2
a=8cm
c)
2α+α=180°
3α=180° /:3
α=60° 2α=120°
d)
2β+4β+210°=360°
6β=360°-210°
6β=150° /:6
β=25° 2β=50° 4β=100°