The Facts On File Algebra Handbook

oblique-angled triangleATRIANGLEthat has no RIGHT ANGLEs.

See alsoSECTION IV CHARTS AND TABLES.

oblique linesAny two lines that meet to form an OBLIQUE ANGLE.

obtuse angleAny ANGLEthat measures between 90°and 180°.

octahedronAn eight-sided POLYHEDRON, in which all eight faces are

EQUILATERAL TRIANGLEs.

See alsoSECTION IV CHARTS AND TABLES.

odd numberAnyNUMBERthat is not exactly divisible by 2.

See alsoSECTION IV CHARTS AND TABLES.

odds The RATIOof an event occurring, based on the number of ways it can

occur divided by the number of ways it will not occur.

open sentenceAnyMATHEMATICAL SENTENCEthat contains a VARIABLE, and

which may be true or false depending on the value SUBSTITUTEd for

the variable.

operations The practice of doing addition, subtraction, MULTIPLICATION, or

division. Some of these operations undo each other, and are called

GLOSSARY oblique-angled triangle – operations

GLOSSARY oblique-angled triangle – operations

Octahedron

Oblique-angled triangle

Obtuse angle