Answer:
Option D
Explanation:
Since they are in proportion. So,
27 : 36 :: 9 : x
27 × x = 36 × 9
x = 36 × 9/27
x = 12 × 1
x = 12
D) 12
27:9=36:x
Well I'm assuming these 2 triangles are similar
Then
3:1=36:x
x=12
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