However, people from ancient astronomers to modern navigators calculated the arc lengths and angles of triangles on a sphere ... Harry Wheeler, Spherical Triangle National Museum of American History ...

Circle geometry Arc length is a fraction of circumference ... Theorem Pythagoras Theorem states that for a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares ...

A segment is the section between a chord and an arc. It is essentially a sector with the triangle cut out, so we need to use our knowledge of triangles here as well. To calculate the area of a ...