One of the two set squares in your instrument box has angles of measure `30^(@) - 60^(@) - 90^(@)`
Take two such identical set - squares .Place them side by side to form a kite like the one shown here .
How many lines of symmetry does the shape have ?
Do you think that some shapes may have more than one line of symmetry ?

Take two identical set squares with angles 30^(@)-60^(@)-90^(@) and place these adjacently to form a parallelogram as shwon in the fig . Does this help you to verify the above property property: The opposite sides of a parallelogram are of equal length.

There are two" set-square" in your box.What are the measures of the anles that ae formed at their corners?Do they have any angle measure that is common?

Copy the figure given here. Take any one diagonal as a line of symmetry and shade a few more squares to make the figure symmetric about a diagonal. Is there more than one way to do that? Will the figure be symmetric about both the diagonals?

You have two set -squares in your mathematical instruments box . Are they symmetric ? There are two set squares in our mathematical instruments box , they are : (i) 30^(@) - 60^(@) - 90^(@) set square (ii) 45^(@)- 45^(@)-90^(@) set square

Take identical cut outs of congruent triangles of sides 3 cm ,4cm , 5cm Arrange them as shown . You get a trapezium (check if) which are the parallel sides here ? should the non -parallel sides be equal ? You can get two more trapeziums using the same set of triangles. Find them out and discuss their shapes.

Balls are arranged in rows to form an equilateral triangle. The first row consists of one ball, the second row of two balls and so on. If 669 more balls are added,then all the balls can be arranged in the shape of a square and each of the sides, then contains 8 balls less than each side of the triangle. Determine the initial number of balls.