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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