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Concept

Obtuse Angle

An obtuse angle is an angle whose measure is greater than

9 0^{\circ}

but less than

18 0^{\circ} .

Applet showing when an angle is acute and when it is not.

When using radians as the unit of measure, an angle is obtuse when its measure is greater than

\frac{π}{2},

or about

1.57,

but less than

π,

or about

3.14,

radians.

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