A yellow equilateral triangle has been painted on a purple sector. The side OC
is 20cm and OA is 12cm. Calculate the area of the purple region ABCD as a
percentage of the area of the whole sector OCD.

Answer

1) Gram Iodine 2) area of clearing or non stained halo

Explanations:

Amylase catalyzes the breakdown of starch into maltose, a disaccharide ( two joined monosaccharide like glucose). This action was the reason why there was zone of clearing since starch molecules has been broken down. If present starch give a blue black colouration with Iodine.