Which transformation of a figure on a coordinate grid preserves congruence?
A (x, y) → (-0.5x, 0.5y)
B (x, y) + (2x, -2y)
C (x, y) → (3x, 3y)
D (x, y) → (-y), -X)

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

if x = 1, then the answer is 3.5

d

step-by-step explanation:

i used the pitagoras theoreme