1
Question
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?
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?
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Solution
Number of
dots in 1 row = 9
Number of
rows = r
Total
number of dots in r rows = Number of rows × Number of
dots in a row
= 9r
Number of
dots in 8 rows = 8 × 9 = 72
Number of
dots in 10 rows = 10 × 9 = 90
Number of dots in 1 row = 9
Number of rows = r
Total number of dots in r rows = Number of rows × Number of dots in a row
= 9r
Number of dots in 8 rows = 8 × 9 = 72
Number of dots in 10 rows = 10 × 9 = 90
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