Problem : Is the following angle acute, obtuse, or right?

Acute

Problem : Is the following angle acute, obtuse, or right?

Obtuse

Problem : Is the following angle acute, obtuse, or right?

Right

Problem : Label the exterior and interior of the following angle.

Problem : What three things must be true of adjacent angles?

Adjacent angles must share a vertex and a side. Third, adjacent angles must not share any interior points.