Question

7. 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?
Need verified answer with full explanation.

Answer 1

Answer:

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Number of dots in a row = 9

Number of rows = r

Total number of dots in r rows

= Number of dots in a row × number of rows = 9r

Number of dots in 8 rows = 8 × 9 = 72

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

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Answer 2

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Complete step-by-step answer:

Given:

The number of dots for each row is x = 9

We know the equation to find the number of dots in the Rangoli for r rows is, x × r

On Substituting the values in the above equation, we get the value as, 9r

Therefore, the number of dots in r rows are 9r dots.

We also know the equation to find the number of dots in a 8 row Rangoli is, 8 × x

Substituting the values in the above equation, we get the value of the number of dots for 8 rows.

8 × x = 8 × 9 = 72

Therefore, the number of dots in 8 rows are 72 dots.

We also know the equation to find the number of dots in 10 row Rangoli is,

10 × x

On Substituting the values in the above equation, we get the value of number of dots for 10 rows

10 × x = 10 × 9 = 90

Therefore, the number of dots in 10 rows is 90 dots.

Therefore, the number of dots in r rows are 9r dots, the number of dots in 8 rows are 72 dots and the number of dots in 10 rows are 90 dots.