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?
Answer:
It is given to us that there are 9 dots in 1 row.
We do not know the number of rows in rangoli. Therefore, number of rows is a variable. Let number of rows = r
Number of dots in rangoli consisting of r rows = 9r
If, r = 8 then the number of dots in rangoli = 9r = 9(8) = 72
If, r = 10, then the number of dots in rangoli = 9r = 9(10) = 90
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