How can you tell by looking at a graph if there is a proportional relationship?

as x increases y increases, as x decreases y decreases, the ratio always stays the same..represents a straight line through the origin.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6