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Which of the shapes below have. (a) line symmetry. (b) rotational symmetry? For line symmetry, copy the shape and draw in the mirror lines. For rotational 9. Right angles measure 90°. 10. Straight angle is an angle that measures 180°, a line. 180 In the diagram, AB is parallel to CD. (a) Work out the size of the angle marked x. . An angle is formed when two lines or rays or line segments meet or intersect. • When the sum of the measures of two angles is 90°, the angles are. LINES AND ANGLES. 6.1Introduction. In Chapter 5, you have studied that a minimum of two points are required to draw a line. You have also studied some Lines and Angles Class 9 NCERT CBSE Download in Pdf. (1) Point - We often represent a point by a fine dot made with a fine sharpened pencil on a piece of Determine the measure of angles formed by intersecting lines. Points intersecting lines line line segment obtuse angle parallel perpendicular plane point ray.Oct 2, 2015 - Angles: Parallel Lines. Video 25 on Corbettmaths. Question 1: Write down the sizes of the lettered angles. (a). (b). (c). (d). (e). (f). Question 2: (a) Which angle is