If an image of a triangle is congruent to the pre-image, what is the scale factor of the dilation? A)0.10 B) 1/2 C)1 D) 10

Option C

Step-by-step explanation:

If the image is congruent (equal corresponding sides and angles) to the pre-image, there is no dilation and the scale factor is 1.

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.