Q. 74.2( 119 Votes )

# Radhika 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?

Answer :

It is given in the question that,

Number of dots in 1 row = 9

Also,

Number of rows = r

Therefore,

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

= 9 × r

= 9r

Hence,

Number of dots in 8 rows = 8 × 9 = 72

Also,

Number of dots in 10 rows = 10 × 9 = 90

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