the value of x is 16 unit
What is similar triangle?
Similar triangles are triangles that have the same shape, but their sizes may vary. All equilateral triangles, squares of any side lengths are examples of similar objects. In other words, if two triangles are similar, then their corresponding angles are congruent and corresponding sides are in equal proportion
According to the question,
if triangles are similar then
ratio of sides are equal,
28/21 = x/12
x = 28 ×12/21
x = 4 × 4
x=16
Hence , the value of x is 16 unit
to learn more about similar triangle from here
https://brainly.com/question/22210734
#SPJ2
