# How do you find the surface area of a parametric equation?

## How do you find the surface area of a parametric equation?

The area between a parametric curve and the x-axis can be determined by using the formula A=∫t2t1y(t)x′(t)dt. The arc length of a parametric curve can be calculated by using the formula s=∫t2t1√(dxdt)2+(dydt)2dt.

What is surface area of revolution?

A surface of revolution is a surface in Euclidean space created by rotating a curve (the generatrix) around an axis of rotation. Examples of surfaces of revolution generated by a straight line are cylindrical and conical surfaces depending on whether or not the line is parallel to the axis.

### What is a non parametric curve?

Curves can be described mathematically by nonparametric or parametric equations. Nonparametric equations can be explicit or implicit. For a nonparametric curve, the coordinates y and z of a point on the curve are expressed as two separate functions of the third coordinate x as the independent variable.

Can a surface area be negative?

To answer you original question, no “area” is never negative.

#### Is a cylinder a surface of revolution?

The cylinder of revolution is the surface generated by the revolution of a line parallel to an axis, around this axis. The cylinder can be developed by mapping a point M to the point of the plane with Cartesian coordinates .

How to find surface area of Revolution of a parametric curve?

We use different formulas to find the surface area of revolution of a parametric curve, depending on whether the axis of revolution is horizontal or vertical. We’ll make the substitution. Evaluate over the interval. Find a common denominator.

## How to calculate the surface area of a curve?

The surface area of the curve is given by S = 2 π ∫ a b f (x) (f ′ (x)) 2 + 1 d x First, find the derivative: f ′ (x) = (x 2) ′ = 2 x (steps can be seen here) Finally, calculate the integral S = ∫ 0 1 2 π x 2 (2 x) 2 + 1 d x = ∫ 0 1 2 π x 2 4 x 2 + 1 d x The calculations and the answer for the integral can be seen here.

How to find the surface area in DS D S?

We know that the surface area can be found by using one of the following two formulas depending on the axis of rotation (recall the Surface Area section of the Applications of Integrals chapter). All that we need is a formula for ds d s to use and from the previous section we have,