Writing a proof for an acute triangle

The video tutorial explains how to prove that triangle DBC is an acute triangle. It begins with an introduction to the concept of two-column proofs and the importance of identifying given information. The tutorial then demonstrates how to calculate the measure of angle BDC using the concept of supplementary angles. Finally, it concludes by proving that triangle DBC is acute, emphasizing the definition of acute angles and the properties of acute triangles.

What must be true for a triangle to be classified as acute?

What is the significance of the angles not being equal in triangle DBC?

Describe the steps taken to prove that triangle DBC is acute.