B06-Estudo da reta Flashcards

1
Q

como se determina uma reta usando matriz

A

usa 2 coordenadas +x e y e iguala o determinante a 0

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2
Q

equação geral da reta

A

ax+by+c=0

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3
Q

eq reduzida da reta

A

Y=mx+n

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4
Q

como acha o coeficiente angular

A

tg de teta(calculado no sentido anti horario x—>y) ou Dy/Dx

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5
Q

m>0

A

reta crescente

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6
Q

m<0

A

reta decrescente

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7
Q

quando falarem de intersecção de reta, o que fazemos?

A

sistema

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8
Q

equação com ponto e coef. angular conhecidos

A

y-y0=m(x-x0)

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9
Q

coeficiente ang e retas paralelas

A

iguais

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10
Q

coeficiente ang de retas perpendiculares

A

opostos e inversos

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11
Q

forma segmentária de uma reta

A

x/p+y/q=1 (p corta o x e q corta o y)

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12
Q

forma paramétrica de uma reta

A

se usa uma terceira variável

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13
Q

distância entre ponto e reta

A

[ax+by+c]/raiz de a²+b² ( x e y são as coordenadas do ponto, abc da reta)

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14
Q

ângulo entre uma reta perpendicular e uma não

A

tgteta=[1/Mr]

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15
Q

ângulo entre duas retas nao verticais

A

tgteta=[mr-ms/1+mr.ms]

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