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Obtuse Angle - An angle having a measure greater than 90° and up to 180°.

Obtuse Triangle - A triangle with at least one obtuse angle as described above.

Octagon - A polygon with 8 sides.

Odds - The ratio/likelihood of an event in probability happening. The odds of flipping a coin and having it land on heads has a 1-2 chance.

Odd Number - A whole number that is not divisible by 2.

Operation - Refers to either addition, subtraction, multiplication or division which are called the four operations in mathematics or arithmetic.

Ordinal - Ordinal numbers refer to the position: first, second, third etc.

Order of Operations - A set of rules used to solve mathematical problems. BEDMAS is often the acronym used to remember the order of operations. BEDMAS stands for 'brackets, exponents, divison, multiplication, addition and subtraction.

Outcome - Used usually in probability to refer to the outcome of an event.

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