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Oblique AngleAn angle that is not a right angle. An acute or obtuse angle.
Obtuse AngleAn angle that is larger than 90 degrees.
Obtuse TriangleA triangle with one angle obtuse.
OctagonA polygon with 8 sides.
Order of OperationsA set of rules for the order in which to solve mathematical problems. The order goes: * and /, + and -. If there are parentheses then work inside them first.
Example: Correct: 1+2*3=7.
Not Correct: 1+2*3=9

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