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

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Solution

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

$c \propto r$

(2)
Consumption of petrol (l) in a car and distance travelled by that car (d) are in direct variation. This statement is written as

$l \propto d$

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

(1) Circumference (c) of a circle is directly proportional to its radius (r). This statement is written as c∝r (2) Consumption of petrol (l) in a car and distance travelled by that car (d) are in direct variation. This statement is written as l∝d

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

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

$c \propto r$

(2)
Consumption of petrol (l) in a car and distance travelled by that car (d) are in direct variation. This statement is written as

$l \propto d$