Odpowiedź :
α = β-15°
180° = 2(β-15°)+β
180° = 2β-30°+β
180° = 3β-30° /+30°
210° = 3β /:3
70° = β
β = 70°
α = β-15° = 70°-15° = 55°
Odp: 55° , 55° i 70°.

α = β-15°
180° = 2(β-15°)+β
180° = 2β-30°+β
180° = 3β-30° /+30°
210° = 3β /:3
70° = β
β = 70°
α = β-15° = 70°-15° = 55°
Odp: 55° , 55° i 70°.