Question

1. choose the best answer. which angle is an obtuse angle? options: c, b, d, a (with images labeled a, b, c, d showing different angles)

Explanation:

An obtuse angle is greater than \(90^\circ\) (a right angle) and less than \(180^\circ\) (a straight angle).

• Option A: The angle is very small, less than \(90^\circ\) (acute angle).
• Option B: The angle is greater than \(90^\circ\) and less than \(180^\circ\), so it is obtuse.
• Option C: The angle is \(90^\circ\) (right angle, indicated by the square corner).
• Option D: The angle is \(180^\circ\) (straight angle).

So the obtuse angle is in option B.

Answer:

B. The angle in option B (since it is greater than \(90^\circ\) and less than \(180^\circ\), fitting the definition of an obtuse angle)