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**[SOLVED] Area of curved space**

## Homework Statement

I have the following metric, which describes a 2D, positive curved space with flat geometry (ie. a sphere):

[tex]

ds^2\,=\,dr^2\,+\,R^2 \sin ^2 (r/R)d\theta ^2

[/tex]

Here ds is the distance between two points (r, theta) and (r + dr, theta + dtheta), R is the radius of the sphere.

I want to find the area of the sphere using this metric.

## The Attempt at a Solution

Using the metric, I have found the circumference of the sphere to be 2*Pi*R (big surprise). Now I want sum up "all the circumferences" on the sphere. Is that possible?