Q:

# How many obtuse angles does a pentagon have?

A:

According to the University of Washington math department, a regular pentagon has five obtuse angles. The sum of all angles for a regular pentagon is 540 degrees, making each angle 108 degrees. Any angle over 90 degrees is obtuse.

## Keep Learning

Credit: Marie Hickman Photolibrary Getty Images

The pentagon is a flat-shaped, five-sided polygon. Irregular polygons are considered convex or concave. When an internal angle of a pentagon is greater than 180 degrees, the pentagon is concave. A convex pentagon is not going to have any internal angles that are greater than 180 degrees, and no angles point inwards as they do within a concave pentagon. If any sides are curved, the figure is not considered a polygon.

Sources:

## Related Questions

• A: A pentagon can have from one to three right angles but only if it is an irregular pentagon. There are no right angles in a regular pentagon.... Full Answer >
Filed Under:
• A: The right angle congruence theorem posits that right angles are always congruent to one another. A right angle is an angle that makes a 1/4-turn of a circl... Full Answer >
Filed Under:
• A: Some parallelograms, such as rectangles and squares, contain right angles. Another type of parallelogram, known as a rhombus, may or may not contain right ... Full Answer >
Filed Under:
• A: Two angles that share a common side and a common vertex, but have no common interior points are called adjacent angles, often abbreviated as "adj." Adjacen... Full Answer >
Filed Under:
PEOPLE SEARCH FOR