Given, $DE=1.5 cm$,$EF=9 cm$, $DF=7.5 cm$ check whether or not the points$D,E$ and $F$are collinear. If yes, which point lies between the other two?

For the triangle shown below, verify that the sum of the lengths of any two sides is greater than third side.

Compare the angles shown below by mere observation and arrange them in the increasing order of their magnitude.

Measure the angle given below using protractor and classify them as acute, obtuse, right, straight, reflex or complete.

Measure the angle given below using protractor and classify them as acute, obtuse, right, straight, reflex or complete.