**1. What is an altitude of a triangle?**

An altitude is the height of a triangle. It is a line from any vertex that meets the opposite side at right angles.

**2. Is the longest side of a triangle always opposite the biggest angle?**

Yes, and the

SMALLESTangle is always opposite theSHORTESTside.

**3. Can a triangle be both EQUILATERAL and RIGHT-ANGLED?**

No, because each angle of an equilateral triangle is 60

°so one of them cannot be a right angle!