**Acute Angle**

**Definition**

The

Acute Angleis ananglewhose measurement is greater than 0° and less than 90°.

Note this definition in the figure below:

The acute angle is a very common angle, we see it in different **geometric figures** such as: triangle, rhombus, circumference, and so on.

**Examples:**

Note different **examples of acute angles**.

In this figure, note how angles depending on their size have different **«openings»**; in addition, they could also be considered as **examples of acute angles:** 1°, 15°, 89.9999° and all those angles that are within: **0° < α < 90°**

**Measurement of an Acute Angle**

Measuring an acute angle is a simple task, for which a **protractor** must be used. Then, the 90° angle is located and the angles below it will be **acute angles**, except for the 0° angle, by definition.

See how it is done:

Here an acute angle equal to 60° has been measured, which is the characteristic angle of an **equilateral triangle**.

**¡Important!**

Another geometric figure where we see **two acute angles** is in the **isosceles triangle**, see the following graph:

The angles «α» are acute; but, «θ» can be acute, right or obtuse.

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