Question

Take a scale and a ‘set square. Arrange the set square on the scale as shown in figure. Along the slant edge of set square draw a line with the pencil. Now slide your set square along its horizontal edge and again draw a line. We observe that the lines are parallel. Why are they parallel ? Think and discuss with your friends.

Answer 1

All slant lines are parallel making an angle of 60° with the horizontal line. In this figure horizontal line is transversal to the slant line and corresponding angles are equal.