Take two identical `30^(@) – 60^(@) – 90^(@)` set squares and form a parallelogram as before. Does the figure obtained help you confirm the above property?

Take two identical set squares with angles 30^(@) – 60^(@) – 90^(@) and place them adjacently as shown in the adjacent figure. Does this help you to verify the above property? Can we say every rectangle is a parallelogram?

Draw an angle /_AOB=40^@ . With the same vertex 'O' draw /_BOC=50^@ , taking bar(OB) is initial ray as shown in the figure. Since the sum of these angles is 90^@ they together form a right angle. Take another pair 60^@ and 50^@ and join in the same way. Do they form complementary angles? Why? Why not?

Take one or two drops of butter milk on a slide, spread it. Heat the slide slightly on a lamp (3-4 seconds). Add a few drops of crystal violet on it. Leave it for 30 to 60 seconds and wash the slide gently with water. Observe the slide under the compound Microscope. Draw rough sketches in your note book of what you have observed.