Draw three appropriate figures satisfying each of the following criteria:
Criterion (1): When sum of two acute angles is an obtuse angle.
Criterion (2) When sum of two acute angles is NOT an obtuse angle.
Criterion (3) When a straight angle is formed using right angles.

For criterion (1), where sum of two acute angles is to be equal to an obtuse angle, following figure can be drawn:
(Note that you can take different angles also. For example, sum of 25⁰ and 80⁰ is 105⁰ which is an obtuse angle).

For criterion (2), where sum of two acute angles is NOT to be equal to an obtuse angle, following figure can be drawn:
(Note that you can take different angles also. For example, sum of 5⁰ and 80⁰ is 85⁰ which is not an obtuse angle).

For criterion (3), where a straight angle is to be drawn using right angles only, following figure can be drawn: