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Key Notes, Chapter-11, Constructions, •, , "Construction" in Geometry means to draw shapes, angles or lines accurately., These constructions use only compass, straightedge (i.e. ruler) and a pencil. This is the "pure", form of geometric construction: no numbers involved., , •, , Construction should be neat and clean and as per scale given in question., , •, , Steps of construction should be provided only to those questions where it is mentioned., , •, , Used of Construction:, (i), , The perpendicular bisector of a chord of a circle passes through its center., , (ii), , Tangents drawn from an external point to a circle are equal., , (iii), , The angle which tangent makes with a chord of a circle is equal to the angle in its, alternate segment., , (iv), , Angles in the same segment are equal., , (v), , The tangent to a circle is perpendicular to the line joining the center and the point of, contact.