Question

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 ?

Answer 1

Number of dots in a row = 9
Number of rows is a variable r.
Total number of dots in r rows = number of dots in one row × number of rows
= 9r

Total number of dots in 8 rows = number of dots in one row × number of rows
= 9 × 8 = 72

Total number of dots in 10 rows = number of dots in one row × number of rows
= 9 × 10 = 90

Answer 2

Step-by-step explanation:

Number of rows= r rows

Number of dots in a row= 9 dots

Total number of dots will be= 9×r

= 9r

Number of dots in 8 rows will be= 9×8

=72 dots

Number of dots in 10 rows= 9×10

= 90 dots

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