Question

3. Write following statements using the symbol of variation.
(2M)
Circumference (c) of a circle is directly proportional to its radius(r).
:) Consumption of petrol (1) in a car and distance travelled by that car (d) are in
direct variation.​

Answer 1

Answer:

c alpha r

l alpha d is right

Answer 2

Given,

Write following statements using the symbol of variation.

Solution,

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

Know that circumference is directly proportional to radius.

$\[\begin{array}{l}C \propto r\\ \Rightarrow C = 2\pi r\end{array}\]$

(2) Consumption of petrol (p) in a car and distance travelled by that car (d) are in direct variation.​

Know that consumption of petrol in a car is increases as the distance travelled by car increases.

$\[\begin{array}{l}p \propto d\\ \Rightarrow p = kd\end{array}\]$