# Basic math glossary-O

Basic math glossary-O define words beginning with the letter O

Oblique angle: An angle that is not a right angle, which means the angle can be acute or obtuse.

Obtuse angle: An angle whose measure is bigger than 90 degrees.

Obtuse triangle: A triangle with one obtuse angle.

Octagon : A polygon with 8 sides and 8 angles.

Negative number: A number that is less than 0.

Odd number: A number that cannot be divided evenly by 2.

Open statement: Also known as open sentence, it is an equation that is neither true or false. For example, n + 6 = 9 is an open statement because we do not know n. Therefore, we have no clue if it is true or false

Order: Sequence from smallest to largest.

Ordered pair: The x and y values that give the location of point in a coordinate system.

Origin: The point where the x-axis and the y-axis intersect with coordinates (0,0).

Ounce:. A unit of weight equal to 1/16 of a pound

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