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?

Given:

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

To do:

We have to find the number of dots her Rangoli has for \( r \) rows, the number of dots if there are 8 rows and the number of dots if there are 10 rows.

Solution:

Let the number of rows be $r$.

Number of dots in a row $= 9$

This implies,

Total number of dots in $r$ rows $=$ Number of dots in a row $\times$ Number of rows

$=9\times r$

$= 9r$

Number of dots in 8 rows $= 9 \times 8$

$=72$

Number of dots in 10 rows $= 9 \times 10$

$= 90$

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Updated on: 10-Oct-2022

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