# What is the equation of helix?

## What is the equation of helix?

A helix running around the x-axis has a parametrization like →r(t)=(ht,Rcost,Rsint). Its tangent vector can be gotten by differentiating →t=d→r(t)dt=(h,−Rsint,Rcost). We note that this has constant length √h2+R2.

**How do you calculate the curvature of a helix?**

In general for the helix r(t)=(acost,asint,bt) the curvature is κ=ab2+a2.

**What is curvature formula?**

The curvature(K) of a path is measured using the radius of the curvature of the path at the given point. If y = f(x) is a curve at a particular point, then the formula for curvature is given as K = 1/R.

### How do you parameterize a helix?

A parametrized helicoid. The function Φ(u,v)=(ucosv,usinv,v) parametrizes a helicoid when 0≤u≤1 and 0≤v≤2π. You can drag the cyan and magenta points on the sliders to change the values of u and v. Or, you can drag the blue point on the helix directly, which will then change u and v so that the blue point is at Φ(u,v).

**What is the length of the pitch of the helix?**

>>The pitch of the DNA helix is 3.4 nm.

**How do you find the arc length of a curve?**

If a curve is defined by parametric equations x = g(t), y = (t) for c t d, the arc length of the curve is the integral of (dx/dt)2 + (dy/dt)2 = [g/(t)]2 + [/(t)]2 from c to d.

#### How do you find the arc curvature?

The arc-length parameterization is used in the definition of curvature. There are several different formulas for curvature. The curvature of a circle is equal to the reciprocal of its radius. The binormal vector at t is defined as ⇀B(t)=⇀T(t)×⇀N(t), where ⇀T(t) is the unit tangent vector.

**What is the curvature of a helix?**

A helix has constant non-zero curvature and torsion.

**What is the parametric equation of circle?**

The equation of a circle in parametric form is given by x=acosθ , y=asinθ .

## What is a parameterized surface?

A parametrization of a surface is a vector-valued function r(u, v) = 〈x(u, v), y(u, v), z(u, v)〉 , where x(u, v), y(u, v), z(u, v) are three functions of two variables. A parametrized surface is the image of the uv-map. The domain of the uv-map is called the parameter do- main.