## How do you convert Cartesian to cylindrical coordinates?

To convert a point from Cartesian coordinates to cylindrical coordinates, use equations r2=x2+y2,tanθ=yx, and z=z.

## How do you find the differential surface area?

The differential surface element, in three-dimentional space, is: dS = √[∂f/∂x)2 + (∂f/∂y)2 + 1]dA. dA = dx dy , the differential surface area element.

**Which are the differential surface in Cartesian coordinate system?**

In any coordinate system it is useful to define a differential area and a differential volume element. In cartesian coordinates the differential area element is simply dA=dxdy (Figure 10.2. 1), and the volume element is simply dV=dxdydz.

**How do you convert Cartesian coordinates to polar coordinates?**

To convert from Cartesian coordinates to polar coordinates: r=√x2+y2 . Since tanθ=yx, θ=tan−1(yx) . So, the Cartesian ordered pair (x,y) converts to the Polar ordered pair (r,θ)=(√x2+y2,tan−1(yx)) .

### What are differential elements?

The differential element or just differential of a quantity refers to an infinitesimal change in said quantity, and is defined as the limit of a change in quantity as the change approaches zero.

### What is a differential volume?

The differential volume is given by the expression. Figure 2.18: Differential elements in a rectangular coordinate system. The volume is enclosed by six differential surfaces. Each surface is defined by a unit vector normal to that surface.

**What is differential area?**

A square of side length x (units) has area A(x)=x2. The derivative of A with respect to the side length is A′(x)=dAdx=2x. But, the derivative gives a rate of change. If the side length changes by an amount Δx, starting from a point x=x0, then the area changes by an amount ΔA.

**What is Theta in cylindrical coordinates?**

The coordinate r is the length of the red line segment from the origin to the red point. The coordinate θ is the angle the red line segment makes with the positive x-axis; it is the angle of the green portion of the portion of the disk in the xy-plane.