Răspuns:
Explicație pas cu pas:
∡AOB+∡BOC=90° si ∡BOC=3∡AOB
3∡AOB+∡AOB=90° ⇒4∡AOB=90° ⇒∡AOB=90°/4=22°15'
a)∡BOC=3·22°15'=66°45'
b) ∡AOB/2+∡B0C/2=(∡AOB+∡B0C)/2=90°/2=45°
c) ∡AOB/2=22°15'/2=11°7'30"
∡AOC/2=90°/2=45°
ungh bisectoarelor=45°-11°7'30"=44°59'60"-11°7'30"=33°52'30"