The missing length y in the given similar triangle will be 13.5 inches.
What is a triangle?
A triangle is a 3-sided shape that is occasionally referred to as a triangle. There are three sides and three angles in every triangle, some of which may be the same.
The sum of all three angles inside a triangle will be 180° and the area of a triangle is given as (1/2) × base × height.
There are many types of triangles such that right angle triangle, equilateral triangle, and much more.
Given,
If two triangles are similar then the ratio of corresponding sides will be the same,
So,
y/18 = 18/24
y = 18²/24
y = 13.5 inches.
Hence the value of y in the given pair of triangles will be 13.5 inches.
For more about triangles,
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