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La integral de Riemann - dmaii

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150 Capítulo 6. <strong>La</strong> <strong>integral</strong> <strong>de</strong> <strong>Riemann</strong><br />

a<br />

(x(t0),y(t0)) = (x(t1),y(t1))<br />

<br />

<br />

El área <strong>de</strong> la figura es t1<br />

t0 y(t)x′ <br />

<br />

(t)dt ,<br />

si la curva es cerrada<br />

Longitud <strong>de</strong> una curva plana<br />

a<br />

y = f (x)<br />

<strong>La</strong> longitud <strong>de</strong> la curva es <br />

b<br />

a 1 + f ′ (x) 2 dx<br />

y = f (x)<br />

y = g(x)<br />

El área <strong>de</strong> la figura es b<br />

a | f (x) − g(x)|dx<br />

b<br />

b<br />

β<br />

α<br />

ρ = ρ(θ)<br />

El área <strong>de</strong> la figura es 1 β<br />

2 α ρ(θ)2 dθ<br />

(x(t1),y(t1))<br />

(x(t0),y(t0))<br />

<strong>La</strong> longitud <strong>de</strong> la curva es <br />

t1<br />

t0<br />

x ′ (t) 2 + y ′ (t) 2 dt

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