1. Adjacent angles have
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite vertex and common
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite .
2. Two adjacent angles are said to form a linear pair of angles, if their
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite are two opposite rays.
3. Two angles formed by two intersecting lines having no common arm are called
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite angles.
4. Angles formed by a number of rays having a
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite point are called angles at a point.
5. If the
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite of two angles is 90 degree then the angles are called complement angle.
6. If the sum of the angles is
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite degree then each of them is called supplement angle.
8. Two acute angles cannot be
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite of each other.
9. A line
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite two or more given lines in a plane at different points is called transversal to the lines.
10. From the given representation we can say that
l and m are
180 arm common common initial intersecting non-common arm parallel sum supplement vertically opposite .