Question

Write the following
statement
using the symbol
of variation.

1.Circumference(c)of a circle is directly proportional to its radius.

ans.



2.Consumption of petrol (l) in a car and distance traveled by that car (d) are in direct variation.

ans. ​

Answer 1

Q. Circumference(c)of a circle is directly proportional to its radius r

Ans. That is, the circumference of a circle is proportional to its radius, R; double R and you double C. The factor '2 pi' is simply the constant of proportionality between C and R. So the area of a circle is proportional to R² and pi is the constant of proportionality between the area and the radius of a circle.

Q. Consumption of petrol (l) in a car and distance traveled by that car (d) are in direct variation.

Ans. Consumption of petrol (1) in a car and distance travelled by that car (d) are in direct variation. This statement is written as

$l \: \infty \: d$

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