∠JOI is a right angle.
∠NOK is an acute angle.
∠JOK is a straight angle.
∠MOK is an acute angle.
∠JON and ∠JOM are obtuse angles.
Right angles are always 90°.
Acute angles are angles less than 90°.
Obtuse angles are angles more than 90°.
Straight angles are always 180°.
For the additional activities, you have to draw angles using the explanations I gave you.