Ответ:
1) ∠5=120°
∠5+∠4=180° ⇒ ∠4=180°-120°=60°
∠5=∠3=∠1=∠7=120° , ∠4=∠2=∠8=∠6=60°
2) ∠1 :∠2=5:4 ⇒ ∠1=5x , ∠2=4x , ∠1+∠2=5x+4x=9x=180° , x=20°
∠1=5*20°=100° , ∠2=4*20°=80°
∠1=∠3=∠5=∠7=100° , ∠2=∠4=∠6=∠8=80°
3) ∠1+∠3=120°
∠1=∠3 ⇒ ∠1=∠3=120°:2=60° ,
∠1+∠2=180° ⇒ ∠2=180°-∠1=180°-60°=120°
∠1=∠3=∠5=∠7=60° , ∠2=∠4=∠6=∠8=120°
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Answers & Comments
Ответ:
1) ∠5=120°
∠5+∠4=180° ⇒ ∠4=180°-120°=60°
∠5=∠3=∠1=∠7=120° , ∠4=∠2=∠8=∠6=60°
2) ∠1 :∠2=5:4 ⇒ ∠1=5x , ∠2=4x , ∠1+∠2=5x+4x=9x=180° , x=20°
∠1=5*20°=100° , ∠2=4*20°=80°
∠1=∠3=∠5=∠7=100° , ∠2=∠4=∠6=∠8=80°
3) ∠1+∠3=120°
∠1=∠3 ⇒ ∠1=∠3=120°:2=60° ,
∠1+∠2=180° ⇒ ∠2=180°-∠1=180°-60°=120°
∠1=∠3=∠5=∠7=60° , ∠2=∠4=∠6=∠8=120°
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Ответ:
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