## Acute angle Chapter 1 (p.37)

### An acute angle is an angle that measures less than 90 degrees

An acute angle is an angle that measures less than 90 degrees. In other words, it is an angle that is smaller than a right angle.

To better understand this concept, let’s consider a few examples:

1. A right angle measures exactly 90 degrees. So any angle that measures less than 90 degrees, such as 45 degrees or 60 degrees, would be classified as an acute angle.

2. Let’s take a look at a triangle. In a triangle, the sum of the interior angles is always 180 degrees. If one of the angles in the triangle measures exactly 90 degrees (a right angle), then the other two angles must both be acute angles because they would be less than 90 degrees.

3. Another example is a clock. If it is 3:00, the minute hand points at 12 while the hour hand points at 3. The angle between the two hands is less than 90 degrees, so it is an acute angle. As the time passes, the angle increases but remains less than 90 degrees until it reaches 6:00 (180 degrees).

It is important to note that acute angles are commonly seen in everyday life and in various geometric shapes. They can be found in triangles, rectangles, squares, and even in parallel lines intersected by a transversal.

Knowing the properties and characteristics of acute angles is essential in geometry, as it helps in solving problems that involve calculating angles, measuring distances, and determining the relationships between different geometric shapes.

In conclusion, an acute angle is simply an angle that measures less than 90 degrees. It is crucial to familiarize oneself with acute angles as they play a significant role in understanding geometry and its applications.

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