"The inclination to each other of two intersecting lines, measured by the arc of a circle intercepted between the two lines forming the angle, the center of the circle being the point of intersection. An acute angle is less than (90^\\circ), a right angle (90^\\circ); an obtuse angle, more than (90^\\circ) but less than (180^\\circ); a straight angle, (180^\\circ); a reflex angle, more than (180^\\circ) but less than (360^\\circ); a perigon, (360^\\circ). Any angle not a multiple of (90^\\circ) is an oblique angle. If the sum of two angles is (90^\\circ), they are complementary angles; if (180^\\circ), supplementary angles; if (360^\\circ), explementary angles."@en . . "Angle" . . . . .