formed by two intersecting planes
Noun [edit]. plane angle â(plural plane angles). ( 1 geometry) An angle formed by two intersecting straight lines. ( 2 geometry) An angle formed by two intersecting planes, measured by the angle between two intersecting straight lines that are in respective planes and perpendicular to the intersection of the planes. (geometry) An angle formed by two intersecting straight lines. ( 2 geometry) An angle formed by two intersecting planes, measured by the angle between two intersecting straight lines that are in respective planes and perpendicular to the intersection of the planes.