Question

Identify the variation as direct, inverse, joint or combined. A = r²

Answer 1

The answer is: Direct variation.

The explanation for this problem is shown below:

1. In direct variation, when a quantity $x$ varies directly as another quantity $y$, the value of the quantity $x$ increases when $y$ increases, and decreases when $y$ decreases.

2. Based on this information, let's see the expression given in the problem:

$A=r^{2}$

3. As you can see, if you give values to $r^{2}$, the value of $A$ will have a direct variation. When $r^{2}$ increases, $A$ increases, and when it decreases $A$ decreases.

Answer 2

Answer : Direct Variation

Question :

Identify the variation as direct, inverse, joint or combined. A = $\pi r^2$

We know direct variation is y = kx

Where k is the constant of proportionality

When value of x increases then y also increases. when x value decreases then y value decreases.

The value of y depends on value of x It means y is directly proportional to x.

Hence A = $\pi r^2$ is a direct variation.