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In the given figure, ∠1 and ∠2,and ∠3 and ∠4 are called opposite angle. The vertically opposite angles are always equal. The opposite angles are called vertically opposite angles.

Vertically Opposite Angles: When two straight lines intersect, then four angles are formed. Here adjacent ∠A and ∠B are linear pair The angle sum of a linear pair is equal to 180 o. Linear Pair: A pair of adjacent angles is called linear pair, if their two non-common arms are opposite rays. Hence, ∠a and ∠b are called the adjacent angles. In the given figure ‘O’ is the common vertex and OB is the common arm. Common arm should be in the middle of rest two sides.Non-common arms are the either side of common arm.are complementary angle.Īdjacent Angles: When two angles have a common arm and common vertex and their non-common arm are the either side of common arm, then they are called adjacent angles. For example 100 o and 80 o, 30 o and 150 o, etc. Both angles are called supplementary to each others. When the sum of two angles is equal to 180 o, then they are called supplementary angles. are complementary angle since their sum is equal to 90 o. For example 30 o and 60 o, 40 o and 50 o, 20 o and 70 o, etc. Both angles are called complementary to each others. When the sum of two angles is equal to 90 o, they are called complementary angles. Reflex Angle: Angles greater than 18090 o are called reflex angles. Straight Angle: Angle equal to 180 o is called Straight Angle. Right Angle: Angle equal to 90 o is called Right Angle. For example: 95 o, 100 o, 110 o, 165 o, etc.Ĭhapter List Integers Fraction & Decimal Data Handling Simple Equation Lines & Angles Triangles Congruence of Triangles Comparing Quantities Rational Numbers Practical Geometry Area Perimeter Algebra Exponents & Power Symmetry Solid Shapes Obtuse Angle: Angles more than 90 o are called Obtuse Angles. The symbol of angle is ∠.Īcute Angle: Angles less than 90 o are called Acute Angles. Common end point which is shared by both the sides (rays) is called vertex of the angle. Angle: A figure formed by two rays having a common end point is called an angle.