Obtuse angle: An angle greater than 90° but less than 180°.Right angle: A right angle is exactly equal to 90°.Acute angle: An acute angle measure between 0° and 90°.Types of Angles : Following are the major types of angles.Angle : The union of two non-collinear rays with a shared beginning point is called an angle.Here the various concepts such as parallel lines, transversal, angles, intersecting lines, interior angles are explained in brief. The important formulas and some note points of Lines and Angles for class 9 notes are provided here. If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely meet on that side on which the angles are less than two right angles.All right angles are equal to one another.A circle can be drawn with any center and any radius.A terminated line can be produced indefinitely.A straight line may be drawn from anyone point to any other point.Postulates : Axioms are the general statements, postulates are the axioms relating to a particular field.Things which coincide with one another are equal to one another.If equals are subtracted from equals, the remainders are equal.If equals are added to equals, the wholes are equal.Things which are equal to the same thing are equal to one another.Axioms: The basic facts which are taken for granted without proof are called axioms.This study basically provides a brief explanation for flat surfaces.
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