<P> The sum of the angles can be arbitrarily small (but positive). For an ideal triangle, a generalization of hyperbolic triangles, this sum is equal to zero . </P> <P> For a spherical triangle, the sum of the angles is greater than 180 ° and can be up to 540 ° . Specifically, the sum of the angles is </P> <Dl> <Dd> 180 ° × (1 + 4f), </Dd> </Dl> <Dd> 180 ° × (1 + 4f), </Dd>

What is the sum of the interior angles of a square