Question

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Answer 1

1°

→BÔC
→BÔA
→AÔC
→BÔE
→BÔC e CÔE
→BÔD e DÔE

2°

A)
x = 3(180-x)
x = 540-3x
4x = 540
x=$\frac{540}{4}$
x=135°

B)

$\left \{ {{x+y=90} \atop {x=2y}} \right.$
2y+y=90
3y=90
y=30
⇒x+y=90
x+30=90
x=90-30
x=30

C)
180°- 72° 15' 18''
179° 60' 60'' - 72° 15' 18''
=107° 45' 42''

D)
2(90°- 42° 27')
2 · 47° 37'
=95° 14'
 
E)
$\left \{ {{x+y=90} \atop {x-y=50}} \right.$
APLICA MÉTODO DA ADIÇÃO
2x=140
x=$\frac{140}{2}$
x=70°
⇒x+y=90
   70+y=90
    y=20°

F)
2x-40+$\frac{x}{2}$=180
$\frac{4x-80+x+35=360}{2}$
4x-80+x+35=360
4x + x = 360 + 35
5x=395
x=$\frac{395}{5}$
x=79

1°ANGULO
2x-40
2·79 - 40
158-40
118°

2° ANGULO 
$\frac{79}{2}$ + 35
39° 30' + 35°
74° 30'
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