Finding Unknown Side Length in Triangles
The image displays two triangles, a LARGER triangle and a SMALLER triangle. The sides of the larger triangle are 21, 15, and 18. The problem states that the ratio of the larger triangle to the smaller triangle is 3, which typically means that each side of the larger triangle is 3 times the length of the corresponding side on the smaller triangle.
To find the unknown side of the smaller triangle, which we will call 'x', we look at the corresponding side on the larger triangle, which is 18. Since the ratio is 3, we divide the larger side by 3 to find the smaller side.
\[ x = \frac{18}{3} \]
\[ x = 6 \]
So, the unknown side of the smaller triangle is 6 units in length.
