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cos20=35/h h=35/cos20=35/0.9396=37.25
sen20=x /h x=h.sen20=37.25*0.342=12.74
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2º
cos 78=y/30 y=30*cos 78= 6,23
sen 78=x/30 x=30*sen 78=29.34
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3º
sen50=45/h h=48/sen50=45/0.766=58.75
cos50=x/h x= h*cos50= 37.76
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14+54+6x+6=180
20x+60=180
x=120/20=6
14*6+54=138º
6x+6)6*6+6=42º
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22x+26+28x+38=180
50x+64=180
x=116/50=2.32
22x+26=22*2.32+26=102.96º
28x+38=28*2.32+38=77.04
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reducimos( div por 10)
x+3y=21
3x+2y=21
la 1ª la multiplicamos por (-3)
-3x-9y=-63
3x+2y=21
sumamos las dos
-7y=-42
y=42/7=6 y=6
x+3y=21 sustituimos el valor de y
x+3*6=21
x=21-18=3 x=3