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  TRIANGLE PUZZLE Counting triangles with in the  particular pattern of Triangle How many possible triangles are in the above figures Formula to count number of triangles like above particular pattern type of Triangle where  “n”  = number of unit triangles in a side Note  : Consider only integer part from answer obtained in above formula ( For example the answer may come 13.12 then consider only “13”. Also remember You don’t have to round off the number for example answer may come 36.8 then consider only “36”. Materials Required A4 sheet Color sketches Scale  Ruler

 PARALLEL AND PERPENDICULAR LINES Parallel and perpendicular lines are an important part of geometry and they have distinct characteristics that help to identify them easily. Two lines are termed as parallel if they lie in the same plane, are the same distance apart, and never meet each other. Perpendicular lines are intersecting lines that always meet at an angle of 90°. Let us learn more about parallel and perpendicular lines in this article. Materials Required A4 Sheet. Match Stick. Glue. Color Sketch. Properties of Parallel Lines Parallel lines are always equidistant from each other. They never meet at any common point. They lie in the same plane. Properties of Perpendicular Lines Perpendicular lines always intersect at 90°. All perpendicular lines can be termed as intersecting lines, but all intersecting lines cannot be called perpendicular because they need to intersect at right angles.