Angles can be grouped into three classes:

**Acute**: angles with measure \( < 90^\circ \).**Right**: angles with measure \( = 90^\circ \).**Obtuse**: angles with measure \( > 90^\circ \).**Straight**: angles with measure \(= 180^\circ \).

Angles can be grouped into three classes:

**Acute**: angles with measure \( < 90^\circ \).**Right**: angles with measure \( = 90^\circ \).**Obtuse**: angles with measure \( > 90^\circ \).**Straight**: angles with measure \(= 180^\circ \).

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## Comments

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TopNewestI prefer it this way:

\[0^\circ<\text{acute angles}<90^\circ\]

\[90^\circ<\text{obtuse angles}<180^\circ\].

Also there is a practice question about straight angles, but you don't have anything about it here. – Mursalin Habib · 2 years, 1 month ago

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