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Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows?

Q. 7.     Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has 9 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?

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M mansi

Number of rows = r

Number of dots in each row  = 9 dots

Thus, the total number of dots = 9r

When the number of rows is 8, then the total number of dots are 9\times8 =72 dots.

When the number of rows is 10, then the total number of dots are 9\times 10=90 dots.

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