The longest side
largest
opposite
across from, or opposite to
Any exterior angle of a triangle always equals the sum of the two interior opposite angles.
The longest side of a triangle is always opposite to its largest angle.
angle with the greatest measure
The longest side
The longest side of a triangle is always opposite its largest angle
shortest
angle
opposite
largest
shortest side
across from, or opposite to
The shortest side of a triangle is opposite to the smallest interior angle.
angle with smallest measure - apex
The angle with the smallest measure is opposite the shortest side. Similarly, the angle with the largest measure is opposite the longest side.