The length of the CD segment is 3cm. Find the length of the segment MN if CD = 4 / 3MN.

To begin with, we substitute CD = 3, it turns out 3 = 4 / 3MN;

To find the length of the segment MN: divide 3 by 4/3;

Since we divide by a fraction, the fraction is reversed and we get the product of the numbers 3 by 3/4;

Multiplying these two numbers we get the answer 9/4;

Answer: the length of the segment is MN = 9/4;

* 9/4 = 2.25 cm;