Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots with chalk powder. She has a dots in a row. How many dots will her rangoli have for r rows? How many dots are there if there are 8 rows? If there are 10 rows?

Number of rows = r Number of dots in a row drawn by Radha = 8 ∴ The number of dots required For r = 1 is 8 x r For r = 2 is 8 x r For r = 3 is 8 x r ∴ Rule is 8r where r represents the number of rows. For r = 8, the number of dots = 8 x 8 = 64 For r = 10, the number of dots = 8 x 10 = 80