作者：Niko Bellic 13 年以前
1252
Angles and Parallel lines
Angles and Parallel Lines
Types of Angles
Complementary angle,if the sum of two angles is 90 deg
Supplementary angle,if the sum of two angle is 180 deg
Adjacent Angles, two angles that share a common side and a common vertex,but do not overlapped
Reflex Angle,angle more than 180 deg but less than 360 deg
Obtuse Angle,angle more than 90 deg but less than 180 deg
Right Angle,angles at 90 deg
Acute Angle,Angle less than 90 deg
Properties
Vertically opposite angles, when two straight line intersect at a point,the two pairs of angles are called vertically opposite angles
Sum of all angles at a point , the sum of all angles at a point is 360 deg
Sum of adjacent angles, The Sum of adjacent angles on a sraight line is 180 deg
