How to use the medians of similar triangles to determine the missing length

The video tutorial covers the concept of medians and bisectors in triangles, focusing on their properties and how they relate to similar triangles. The teacher explains the process of calculating ratios and solving problems using cross-multiplication. The session includes a mix of geometry and basic arithmetic, with a brief mention of science topics like friction and Newton's law. The tutorial aims to enhance understanding of geometric properties and problem-solving techniques.

What is the significance of a bisector in a triangle?

How do the lengths of the medians compare to the sides of similar triangles?

What is the process to find the ratio of medians in a triangle?

Explain the method of cross-multiplying in the context of triangle medians.

What is the final answer when calculating 21 times 12 in the context of the discussion?