Radha is drawing a dot rangoli . beautiful pattern of lines of joining dots with chalk powder. she has nine 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 that: number of dots in 1 row = 9

Number of rows = 9

So, Total number of dots in r rows = Number of dots in 1 row × Total number of row

= 9×r

Hence, If number of rows = 8

Then, total number of dots in 8 rows = 9×8 = 72

And,

If number of rows = 10

Then, total number of dots in 10 rows = 9×10 = 90

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