Răspuns:
Explicație:
<a1+<b2=180 gr (< interne de aceeasi parte a secantei)
A1/7+ b2/8= k
<a1=7k
<b2=8k
7k+8k=180
15k=180
K=180:15
K=12
<a1= 7 ori 12=> <a1=84 grade
<b2= 8 ori 12=> <b2=96 grade
b) daca [oc bisect <b2=> <abc= <b2 :2=> <abc= 96:2=> <abc=48 grade
In triunghiul abc:
<a=84 gr
< abc=48 grade
< acb=180 gr-96 gr-48 gr
<acb=36 gr