<P> In plane geometry , an angle is the figure formed by two rays , called the sides of the angle , sharing a common endpoint , called the vertex of the angle . Angles formed by two rays lie in a plane , but this plane does not have to be a Euclidean plane . Angles are also formed by the intersection of two planes in Euclidean and other spaces . These are called dihedral angles . Angles formed by the intersection of two curves in a plane are defined as the angle determined by the tangent rays at the point of intersection . Similar statements hold in space , for example , the spherical angle formed by two great circles on a sphere is the dihedral angle between the planes determined by the great circles . </P>
<P> In plane geometry , an angle is the figure formed by two rays , called the sides of the angle , sharing a common endpoint , called the vertex of the angle . Angles formed by two rays lie in a plane , but this plane does not have to be a Euclidean plane . Angles are also formed by the intersection of two planes in Euclidean and other spaces . These are called dihedral angles . Angles formed by the intersection of two curves in a plane are defined as the angle determined by the tangent rays at the point of intersection . Similar statements hold in space , for example , the spherical angle formed by two great circles on a sphere is the dihedral angle between the planes determined by the great circles . </P>
the intersection of the two sides of an angle is called the angles
the intersection of the two sides of an angle is called the angles
vertex
vertex