If one angle of a triangle is equal to the sum of the other two, show that the triangle is a right triangle.

The measures of three angles are given. State whether the angles can possibly be those of a triangle.

 $63°, 37°, 80°$

The measures of three angles are given. State whether the angles can possibly be those of a triangle.

$45°, 61°, 73°$

The measures of three angles are given. State whether the angles can possibly be those of a triangle.

$59°, 72°, 61°$

The measures of three angles are given. State whether the angles can possibly be those of a triangle.

$45°, 45°, 90°$

The measures of three angles are given. State whether the angles can possibly be those of a triangle.

$30°, 20°, 125°$