Question

Julio considers the reduction of the triangle.

What is the correct cross product that he should use to solve for the missing dimension?
(8)(12) = 21x
(8)(21) = 12x
(12)(8) = 12x
(12)(21) = 8x

Answer 1

(12)(21) = 8x or d

Explanation:

Answer 2

For this case we observe that the triangles are similar.
Therefore, we can use the following relationship:
(12) / (21) = (8) / (x)
From here, we can clear to know the value of the incognita x.
Answer:
the correct cross product that should be used to solve for the missing dimension is:
(12) / (21) = (8) / (x)