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2014-05-28T20:41:19+03:00
X+y+z=180
{x,y,z} ip{1/4,1/5,1/9}
x/4=y/5=z/9=k
x/4=k⇒   x=4k
x/5=k⇒   y=5k
z/9=k⇒   z=9k
4k+5k+9k=180
18k=180
k=180/18=10
x=4·10=40 grade
y=5·10=50 grade
z=9·10=90 grade
pt.ca un unghi are masura de 90 grade este un triunghi dreptunghic

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