Răspuns :
m(abc)+m(bac)+m(bca)=180
x+47+90+x-13=180
2x=56
x=28
m(abc)=x+47
m(abc)=28+47
m(abc)=75
m(bca)=x-13
m(bca)=28-13
m(bca)=15
x+47+90+x-13=180
2x=56
x=28
m(abc)=x+47
m(abc)=28+47
m(abc)=75
m(bca)=x-13
m(bca)=28-13
m(bca)=15
Răspuns:
x garde = 28 grade
EXPLICATIE PAS CU PAS:
ungiul a = 90 de grade
ungiul b = x grade+47 grade
ungiul c = x grade-13 grade
ungiul a +ungiul b +ungiul c=180 de grade
90 de grade+(x grade+47 grade)+(x grade - 13 grade)=180 grade/-90 grade<=>
<=>x grade+47 grade+(x grade - 13 grade)=90 grade/-47 grade<=>
<=>x grade+x grade - 13 grade=43 grade/+13 grade<=>
<=>x grade+x grade=56 grade/ :2<=>
<=>x grade=28 grade