Presentation on theme: "P ARAMETRIC AND P OLAR I NTEGRATION. A REA E NCLOSED P ARAMETRICALLY Suppose that the parametric equations x = x(t) and y = y(t) with c t d, describe."— Presentation transcript:
A REA E NCLOSED P ARAMETRICALLY Suppose that the parametric equations x = x(t) and y = y(t) with c t d, describe a curve that is traced out clockwise exactly once, as t increases from c to d and where the curve does not intersect itself, except that the initial and terminal points are the same. Then, the enclosed area is given by If the curve is traced out counterclockwise, then the enclosed area is given by
A REA P ARAMETRICALLY Example: Find the area enclosed by the path of the Scrambler (a popular carnival ride) if its path is represented by (Curve is traced out counterclockwise once for 0 t 2 ) (fInt)
The equation for the length of a parametrized curve is similar to our previous “length of curve” equation: (Notice the use of the Pythagorean Theorem.) (proof on pg. 721)
P ARAMETRIC A RC L ENGTH A circle of radius 1 rolls around the circumference of a larger circle of radius 4. The epicycloid traced by a point on the circumference of the smaller circle is given by and Find the distance traveled by the point in one complete trip about the larger circle.
Likewise, the equations for the surface area of a parametrized curve are similar to our previous “surface area” equations:
S URFACE A REA Find the surface area of the surface formed by revolving the curve and for about the line x = 2.
The length of an arc (in a circle) is given by r. when is given in radians. Area Inside a Polar Graph: For a very small , the curve could be approximated by a straight line and the area could be found using the triangle formula:
We can use this to find the area inside a polar graph. P OLAR A REA
Example: Find the area enclosed by: (lima ƈon Specifically a Cardiod) P OLAR A REA