Answer:

1. An angle is a combination of two rays (half-lines) with a common endpoint.

2. In its degrees.

3. Acute Angle - An angle less than 90 degrees.

Right Angle - An angle that is exactly 90 degrees.

Obtuse Angle - An angle more than 90 degrees and less than 180 degrees.

4. A protractor

Step-by-step explanation:

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Answer:

What is an angle?

An angle is a measure of a turn, measured in degrees or °. There are 360° in a full turn. You can find out the size of an angle using a protractor.

How do you name and classify an angle?

There are three ways to name an angle--by its vertex, by the three points of the angle (the middle point must be the vertex), or by a letter or number written within the opening of the angle.

What are the three main classifications of angle according to its measures?

• Acute Angle - An angle less than 90 degrees.
• Right Angle - An angle that is exactly 90 degrees.
• Obtuse Angle - An angle more than 90 degrees and less than 180 degrees.

What is the most common device to measure angles?

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