The Area of a Triangle on a Sphere calculator computes the surface area of a triangle on a sphere based on the angle of the three corners and the radius of the sphere.
INSTRUCTIONS: Choose units and enter the following:
Area of Triangle on a Sphere (A): The calculator returns the area in square kilometers. However this can be automatically converted to compatible units via the pull-down menu.
The formula for the area of a spherical triangle on the surface of a sphere of radius ( r) formed by three great circle arc is:
A = (α + β + γ - π)⋅r2
The triangle is defined by three angles (α,β,γ) at the vertices of the triangle.