Question

1. choose the best answer. what type of angle is ∠abd if it measures greater than 0° but less than 90°?

right angle
obtuse angle
straight angle
acute angle

Explanation:

To determine the type of angle \( \angle ABD \) with a measure between \( 0^\circ \) and \( 90^\circ \), we recall the definitions of angle types:

• A right angle measures exactly \( 90^\circ \).
• An obtuse angle measures greater than \( 90^\circ \) but less than \( 180^\circ \).
• A straight angle measures exactly \( 180^\circ \).
• An acute angle measures greater than \( 0^\circ \) but less than \( 90^\circ \).

Since \( \angle ABD \) has a measure in the range \( 0^\circ < \text{measure} < 90^\circ \), it fits the definition of an acute angle.

Answer:

D. acute angle