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?

Explanation

In a row, number of dots were drawn`=9`

When number of rows is `r`.

Total number of dots `=` Number of dots in a row `×` Number of rows

`= 9 × r `

`= 9r`

Hence, rangoli have `9r` dots for `r` rows.

If there are `8` rows,

Number of dots `=9×8`

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