Acute Angle; Right Angle and Obtuse Angle

Explanation

To solve the question regarding acute angles, right angles, and obtuse angles, we will define each type of angle based on their measurements.

### Step-by-Step Solution:

1. **Understanding Angles**:
- An angle is formed by two rays (or lines) that originate from a common point, called the vertex. For example, if we have points A, B, and C, the angle can be represented as ∠BAC or ∠CAB.

2. **Defining the Measurement of Angles**:
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