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asked Jul 29, 2014 in GEOMETRY by anonymous
reshown Jul 29, 2014 by bradely

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Sector area A = πr² * [central angle / 360^o], where r = radius.

Central angle = 360^o - 120^o = = 240^o and radius r = 9 units.

A = π(9)² * [240^o / 360^o]

A = π(81) * (2 / 3)]

A = 54π square units.

The fourth option is correct.

answered Jul 29, 2014 by casacop Expert