Find the missing length of the triangle.

There are special properties to certain right triangles.

A 3-4-5 triangle will always be a right triangle. 9 divides into 3, and 15 divides into 5, so you can use ratios to find b.

Since 9 divides into 3, we will use this to set up proportions for the missing value:



Cross multiply the fractions.



Divide both sides by 3.



The missing value is 12.

The answer would be d i think but i’m for sure it is not a and c