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To classify the four angles of the given quadrilateral:

- **Angle A (∠A)** is labeled as **70°**, which is **acute** (since an acute angle is less than 90°).
- **Angle B (∠B)** is labeled as **140°**, which is **obtuse** (since an obtuse angle is between 90° and 180°).
- **Angle C (∠C)** is labeled as **60°**, which is **acute** (since it's less than 90°).
- **Angle D (∠D)** is labeled as **90°**, which is a **right** angle (since it's exactly 90°).

So, the classification would be:

1. **∠A**: Acute  
2. **∠B**: Obtuse  
3. **∠C**: Acute  
4. **∠D**: Right  

Would you like further details or explanations on any part of this? 

Here are five related questions for deeper exploration:
1. How do you classify angles when given different degrees?
2. What is the sum of the interior angles of any quadrilateral?
3. How can you determine the type of a quadrilateral based on its angles?
4. What are some examples of quadrilaterals with different angle combinations?
5. How can adjacent angles help determine the overall shape of a polygon?

**Tip:** The sum of the interior angles of any quadrilateral is always 360°, which can help in cross-checking the given angles!

Classify the four angles of the quadrilateral.

Learn how to classify the four angles of a quadrilateral by identifying whether each is acute, right, or obtuse. In this example, the angles are 70°, 140°, 60°, and 90°, covering key geometry concepts suitable for students in Grades 6-8.

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