angle science definition

1. A geometric figure formed by two lines that begin at a common point or by two planes that begin at a common line.
2. The space between such lines or planes, measured in degrees. See also acute angle, obtuse angle, right angle.

angle

top left to right: acute, right, and obtuse angles; two pairs of alternating angles (the exterior alternating pair is light gray, the interior alternating pair is dark gray);

bottom left to right: complementary angles, supplementary angles, and adjacent angles