Which statements about the sum of the interior angle measures of a triangle in Euclidean and non-Euclidean geometries are true? In Euclidian geometry, the sum of the interior angle measures of a triangle is 180 degrees, but in elliptical or spherical geometry the sum is less than 180 degrees. In Euclidian geometry, the sum of the interior angle measures of a triangle is 180 degrees, but in elliptical or spherical geometry the sum is greater than 180 degrees. In Euclidian geometry, the sum of the interior angle measures of a triangle is less than 180 degrees, but in hyperbolic geometry, the sum is equal to 180 degrees. In Euclidian geometry, the sum of the interior angle measures of a triangle is greater than 180 degrees, but in hyperbolic geometry, the sum is less than 180 degrees. In Euclidian geometry, the sum of the interior angle measures of a triangle is 180 degrees, but in hyperbolic geometry, the sum is less than 180 degrees.