Răspuns :
P=72
72-30=42⇒
AB=AC=42/2=21
mas<B+mas<C=180-90=90
AB=AC ⇒mas<B=mas<c=90/2=45
sin<B=sin<C=45=√2/3
sin<B+sin<C=√2/3+√2/3=2√2/3
72-30=42⇒
AB=AC=42/2=21
mas<B+mas<C=180-90=90
AB=AC ⇒mas<B=mas<c=90/2=45
sin<B=sin<C=45=√2/3
sin<B+sin<C=√2/3+√2/3=2√2/3