Q:
# What Is a 180-Degree Angle Called?

**A 180-degree angle is called a straight angle.** Angles that are exactly 90 degrees are called right angles, while those that are between 0 and 90 degrees are called acute. Angles that are between 90 and 180 degrees are considered obtuse.

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Once an angle is larger than 180 degrees, it is categorized as a reflex angle. As a reflex angle turns one full rotation of 360 degrees, a circle is formed.

Angles are created when two straight lines intersect. The place where the two lines meet is called the vertex, while the two lines are called the arms of the angle. Rotating one of the arms either increases or decreases the angle measurement depending upon the direction of rotation.

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Q:
## How Do You Measure Angles?

A: Use a protractor to measure the number of degrees in an angle. Place the protractor over the angle so that one line goes along the protractor's zero degree... Full Answer >Filed Under: -
Q:
## How Do You Calculate the Area of an Obtuse Triangle?

A: To find the area of a triangle without a right angle, you multiply one-half the base by the height. Obtuse triangles are included in this group. Full Answer >Filed Under: -
Q:
## What Is a Figure Formed by Two Rays With a Common Endpoint?

A: A figure formed by two rays meeting at a common endpoint is called an angle. The endpoint where the two rays meet is called the vertex. Angles are usually ... Full Answer >Filed Under: -
Q:
## What Is the Intersection of Two Rays With a Common Endpoint?

A: The vertex is the common endpoint when two rays intersect to form an angle. The formed angle is named by using three points. One point is on each of the tw... Full Answer >Filed Under: