Math, asked by ibrahimghauri07, 7 months ago

The area of a circle, A , is directly proportional to the square of its radius, r . Write down a formula, using k , connecting the area of the circle and the length of its radius.

Answers

Answered by athpatil
11

Answer:The variable y is said to be directly proportional to x if

y = kx for some non-zero constant k.

The constant k is called the constant of proportionality.

The statement, ‘y is directly proportional to x’, is written symbolically as

y proportion x.

Sometimes in the literature the word variation is used instead of proportion.

The graph of y = kx is a straight line passing through the origin. Its gradient k is the constant of proportionality. (The values that x can take are often the positive real numbers, but this is not always the case.)

Here is a simple example of direct proportion.

David drives from his home at a constant speed of 100km/h.

The formula for the distance d km travelled in t hours is

Step-by-step explanation:

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